Hot water at temperature of t is added to twice that amount of water at a temperature of 30°C. If the resulting temperature of the mixture is 50°C, calculate t
A
40°C
B
80°C
C
90°C
D
50°C
Verified Correct Answer: C.
Step-by-Step Mathematical Solution
Heat loss by hot water = Heat gained by water
mc(t - 50) = 2mc(50 - 30)
t - 50 = 2(20)
t - 50 = 40
t = 40 + 50
\(\therefore\) t = 90°C
Source: WAEC / JAMB / NECO Classroom Archive (Record #76353)