A tap supplies water at 26°C while another supplies water at 82°C. If a man wishes to bathe with water at 40°C the ratio of hot mass of hot water to that of cold water required is?

A. 1:3
B. 3:1
C. 3:7
D. 7:3
E. 15:8

Correct Answer:

Option A – 1:3

Explanation

heat supplied by hot water = heat gained by cold water M1C(82 – 40) = M2C(40 – 26)

M2/M1= 14/42

= 1: 3