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Mathematics
UTME / JAMB 1986
Number and Numeration
Solution
Divide the L.C.M of 48, 64, and 80 by their H.C.F
A
20
B
30
C
48
D
60
medium Difficulty
Verified Correct Answer: Option D
Step-by-Step Mathematical Solution
48 = 24 x 3, 64 = 26, 80 = 24 x 5
L.C.M = 26 x 3 x 5
H.C.F = 24
\(\frac{2^6 \times 3 \times 5}{2^4}\)
= 22 x 3 x 5
= 4 x 3 x 5
= 12 x 5
= 60
Source: Myschool Past Questions Archive (Record #32004)
Mathematics
UTME / JAMB 1986
Number and Numeration
Solution
Find the smallest number by which 252 can be multiplied to obtain a perfect square
A
2
B
3
C
5
D
7
medium Difficulty
Verified Correct Answer: Option D
Step-by-Step Mathematical Solution
\(252 = 2^{2} \times 3^{2} \times 7\)
\(\therefore\) To make 252 a perfect square, the smalest number to multiply with = 7.
\(252 \times 7 = 1764 = 42^{2}\)
Source: Myschool Past Questions Archive (Record #32009)
Mathematics
UTME / JAMB 1986
Number and Numeration
Solution
Find the reciprocal of \(\frac{\frac{2}{3}}{\frac{1}{2} + \frac{1}{3}}\)
A
\(\frac{4}{5}\)
B
\(\frac{5}{4}\)
C
\(\frac{2}{5}\)
D
\(\frac{6}{7}\)
medium Difficulty
Verified Correct Answer: Option B
Step-by-Step Mathematical Solution
\(\frac{2}{3}\) = \(\frac{2}{3}\)
= \(\frac{2}{3}\) x \(\frac{6}{5}\)
= \(\frac{4}{5}\)
reciprocal of \(\frac{4}{5}\) = \(\frac{1}{\frac{4}{5}}\)
= \(\frac{5}{4}\)
Source: Myschool Past Questions Archive (Record #32013)
Mathematics
UTME / JAMB 1986
Number and Numeration
Solution
Three boys shared some oranges. The first received \(\frac{1}{3}\) of the oranges, the second received \(\frac{2}{3}\) of the remainder. If the third boy received the remaining 12 oranges, how many oranges did they share?
A
60
B
54
C
48
D
42
medium Difficulty
Verified Correct Answer: Option B
Step-by-Step Mathematical Solution
let x represent the total number of oranges shared, let the three boys be A, B and C respectively. A received \(\frac{1}{3}\) of x, Remainder = \(\frac{2}{3}\) of x . B received \(\frac{2}{3}\) of remainder (i.e.) \(\frac{2}{3}\) of x
∴ C received \(\frac{2}{3}\) of remainder (\(\frac{2}{3}\) of x) = 12
\(\frac{1}{3}\) x \(\frac{2x}{3}\) = 12
2x = 108
x = 54
Source: Myschool Past Questions Archive (Record #32017)
Mathematics
UTME / JAMB 1986
Number and Numeration
Solution
If P = 18, Q = 21, R = -6 and S = -4, Calculate \(\frac{(P- Q)^3 + S^2}{R^3}\)
A
\(\frac{-11}{216}\)
B
\(\frac{11}{216}\)
C
\(\frac{-43}{116}\)
D
\(\frac{43}{116}\)
medium Difficulty
Verified Correct Answer: Option B
Step-by-Step Mathematical Solution
\(\frac{(P- Q)^3 + S^2}{R^3}\) = \(\frac{(18 - 21)^3 + (-4)^2}{(-6)^3}\)
= \(\frac{-27 + 16}{R^3}\)
= \(\frac{-11}{-216}\)
= \(\frac{11}{216}\)
Source: Myschool Past Questions Archive (Record #32018)
Mathematics
UTME / JAMB 1986
Number and Numeration
Solution
Simplify \(\frac{0.0324 \times 0.00064}{0.48 \times 0.012}\)
A
3.6 x 102
B
3.6 x 10-2
C
3.6 x 10-3
D
3.6 x 10-4
medium Difficulty
Verified Correct Answer: Option C
Step-by-Step Mathematical Solution
\(\frac{0.0324 \times 0.00064}{0.48 \times 0.012}\) = \(\frac{324 \times 10^{-4} \times 10^{-5}}{48 x 10^{-2} x 12 x 10^{-3}}\)
\(\frac{324 \times 64 \times 1 0^{-9}}{48 \times 12 \times 10^{-5}}\) = 36 x 10-4
= 3.6 x 10-3
Source: Myschool Past Questions Archive (Record #32019)
Mathematics
UTME / JAMB 1986
Number and Numeration
Solution
Udoh deposited N150.00 in the bank. At the end of 5 years the simple interest on the principal was N55.00. At what rate per annum was the interest paid?
A
11%
B
7\(\frac{1}{3}\)%
C
5
D
3\(\frac{1}{2}\)%
medium Difficulty
Verified Correct Answer: Option B
Step-by-Step Mathematical Solution
S.I = \(\frac{PTR}{100}\)
R = \(\frac{100}{PT}\)
\(\frac{100 \times 50}{150 \times 6}\) = \(\frac{22}{3}\)
= 7\(\frac{1}{3}\)%
Source: Myschool Past Questions Archive (Record #32023)
Mathematics
UTME / JAMB 1986
Number and Numeration
Solution
A number of pencils were shared out among Bisi, Sola and Tunde in the ratio of 2 : 3 : 5 respectively. If Bisi got 5, how many were share out?
A
15
B
25
C
30
D
50
medium Difficulty
Verified Correct Answer: Option B
Step-by-Step Mathematical Solution
Let x r3epresent total number of pencils shared
B : S : T = 2 + 3 + 5 = 10
2 : 3 : 5
= \(\frac{2}{10}\) x y
= 5
2y =5
2y = 50
∴ y = \(\frac{50}{2}\)
= 25
Source: Myschool Past Questions Archive (Record #32026)
Mathematics
UTME / JAMB 1986
Number and Numeration
Solution
In 1984, Ike was 24 yrs old and his father was 45 yrs old. In what year was Ike exactly half his father's age?
A
1981
B
1979
C
1982
D
1978
medium Difficulty
Verified Correct Answer: Option A
Step-by-Step Mathematical Solution
Let the no. of years be y
24 - y = \(\frac{1}{2}\)(45 - y)
45 - y = 2(24 - y)
45 - y = 48 - 2y
2y - y = 48 - 45
∴ y = 3
The exact year = 1984
1984 - 3 = 1981
Source: Myschool Past Questions Archive (Record #32031)
Mathematics
UTME / JAMB 1986
Number and Numeration
Solution
Simplify \((\frac{1}{\sqrt{5} + \sqrt{3}} - \frac{1}{\sqrt{5} - \sqrt{3}}) \times \frac{1}{\sqrt{3}}\)
A
\(\frac{\sqrt{3}}{\sqrt{5}}\)
B
\(\frac{2 \sqrt{3}}{7}\)
C
-2
D
-1
medium Difficulty
Verified Correct Answer: Option D
Step-by-Step Mathematical Solution
\((\frac{1}{\sqrt{5} + \sqrt{3}} - \frac{1}{\sqrt{5} - \sqrt{3}}) \times \frac{1}{\sqrt{3}}\)
\(\frac{1}{\sqrt{5} + \sqrt{3}} - \frac{1}{\sqrt{5} - \sqrt{3}}\)
\(\frac{(\sqrt{5} - \sqrt{3}) - (\sqrt{5} + \sqrt{3})}{(\sqrt{5} + \sqrt{3})(\sqrt{5} - \sqrt{3})}\)
= \(\frac{\sqrt{5} - \sqrt{3} - \sqrt{5} - \sqrt{3}}{5 - \sqrt{15} + \sqrt{15} - 3}\)
= \(\frac{-2\sqrt{3}}{2}\)
= \(- \sqrt{3}\)
\(\therefore (\frac{1}{\sqrt{5} + \sqrt{3}} - \frac{1}{\sqrt{5} - \sqrt{3}}) \times \frac{1}{\sqrt{3}} = - \sqrt{3} \times \frac{1}{\sqrt{3}}\)
= \(-1\)
Source: Myschool Past Questions Archive (Record #32036)
Mathematics
UTME / JAMB 1986
Number and Numeration
Solution
Find n if lo\(g_2\) 4 + lo\(g_2\) 7 - lo\(g_2\) n = 1
A
10
B
14
C
27
D
28
medium Difficulty
Verified Correct Answer: Option B
Step-by-Step Mathematical Solution
log\(_2\) 4 + log\(_2\) 7 - log\(_2\) n = 1
= log\(_2\) (4 x 7) - log\(_2\) n = 1
\(\therefore\) log\(_2\) 28 - log\(_2\) n = 1
= \(\frac{28}{n} = 2^1\)
\(\frac{28}{n}\) = 2
2n = 28
∴ n = 14
Source: Myschool Past Questions Archive (Record #32041)
Mathematics
UTME / JAMB 1986
Number and Numeration
Solution
Simplify \(\frac{9^{\frac{1}{3}} \times 27^{-\frac{1}{2}}}{3^{-\frac{1}{6}} \times 3^{\frac{-2}{3}}}\)
A
\(\frac{1}{3}\)
B
1
C
3
D
9
medium Difficulty
Verified Correct Answer: Option B
Step-by-Step Mathematical Solution
\(\frac{9^{\frac{1}{3}} \times 27^{-\frac{1}{2}}}{3^{-\frac{1}{6}} \times 3^{-\frac{2}{3}}}\) = \(\frac{(3^2)^{\frac{1}{3}} \times (3^3)^{-\frac{1}{3}}}{3^{-\frac{1}{6}} \times 3^{-\frac{2}{3}}}\)
= \(\frac{3^{\frac{2}{3}} \times 3^{-\frac{3}{2}}}{3^{-\frac{1}{6}} \times 3^{-\frac{2}{3}}}\)
= \(\frac{3^{-\frac{5}{6}}}{3^{-\frac{5}{6}}}\)
= 1
Source: Myschool Past Questions Archive (Record #32057)
Mathematics
UTME / JAMB 1986
Number and Numeration
Solution
Factorize completely 8a + 125ax\(^3\)
A
(2a + 5x2)(4 + 26ax)
B
a(2 + 5x)(4 - 10x + 25x2)
C
(2a + 5x)(4 - 10ax + 25x2)
D
a(2 + 5x)(4 + 10ax + 25x2)
medium Difficulty
Verified Correct Answer: Option B
Step-by-Step Mathematical Solution
\(8a + 125ax^{3} = (2^{3})a + 5^{3} ax^{3}\)
= \(a(2^3 + 5^3 x^3)\)
∴\(a[2^3 + (5x)^3]\)
\(a^3 + b^3 = (a + b)(a^2 - ab + b^2)\)
∴ \(a(2^3 + (5x)^3)\)
= \(a(2 + 5x)(4 - 10x + 25x^2)\)
Source: Myschool Past Questions Archive (Record #32076)
Mathematics
UTME / JAMB 1986
Number and Numeration
Solution
If y = \(\frac{x}{x - 3}\) + \(\frac{x}{x + 4}\) find y when x = -2
A
-\(\frac{3}{5}\)
B
\(\frac{3}{5}\)
C
-\(\frac{7}{5}\)
D
\(\frac{2}{5}\)
medium Difficulty
Verified Correct Answer: Option A
Step-by-Step Mathematical Solution
y = \(\frac{x}{x - 3}\) + \(\frac{x}{x + 4}\) when x = -2
y = \(\frac{-2}{-5}\) + \(\frac{(-2)}{-2 + 4}\)
= \(\frac{2}{5}\) + \(\frac{-2}{2}\)
= \(\frac{4 -10}{10}\)
= \(\frac{-6}{10}\)
= -\(\frac{3}{5}\)
Source: Myschool Past Questions Archive (Record #32079)
Mathematics
UTME / JAMB 1986
Number and Numeration
Solution
Factorize \(x^2 + 2a + ax + 2x\)
A
(x + 2a)(x + 1)
B
(x + 2a)(x - 1)
C
(x2 - 1)(x - a)
D
(x + 2)(x + a)
medium Difficulty
Verified Correct Answer: Option D
Step-by-Step Mathematical Solution
\(x^{2} + 2a + ax + 2x\)
\(x^{2} + 2a + ax + 2x\)
\(x(x + 2) + a(x + 2)\)
\((x + 2)(x + a)\)
Source: Myschool Past Questions Archive (Record #32081)