Chemistry Help?

Question

A biology experiment requires the preparation of a water bath at 37.0°C (body temperature). The temperature of the cold tap water is 22.0°C, and the temperature of the hot tap water is 61.0°C. If a student starts with 70.0 g of cold water, what mass of hot water must be added to reach 37.0°C?

Answer 1

Let mass of hot water = m

So, 70*s*(37-22) = m*s*(61-37)

or 70*5 = m*24

or m = 350/24 = 14.583 g