We have 100 ml of hot water (at temperature x°C) and 200 ml of water at 48°C. What is the temperature of hot water x°C when the resulting mixture has a temperature of 65°C?

GMAT QUANT Problem Solving Level 500 600 Mixtures proportions ratio

We have 100 ml of hot water (at temperature x°C) and 200 ml of water at 48°C. What is the temperature of hot water x°C when the resulting mixture has a temperature of 65°C?

A) 38°C
B) 48°C
C) 58°C
D) 66°C
E) 99°C