If p * q = 2p + pq + q, find p when ( p * 2) - (p * 1) = 40
A
39
B
40
C
41
D
42
Verified Correct Answer: A.
Step-by-Step Mathematical Solution
p * q = 2p + pq + q
(p*2) - (p*1) = 40
firstly, p = p and q = 2, secondly p = p and q = 1
then, 2p + 2p + 2 - (2p + p + 1) = 40
4p + 2 - 3p - 1 = 40
p + 1 = 40
p = 40 - 1 = 39
Source: WAEC / JAMB / NECO Classroom Archive (Record #70180)