JEE Previous Year Question

For an ideal heat engine, the temperature of the source is ${127}^{\circ }C$. In order to have $60\text{\%}$ efficiency the temperature of the sink should be $\text{\_}\text{\_}\text{\_}\text{\_}$ ${}^{\circ }C$ .(Round off to the Nearest Integer) (write modulus or absolute value of the temperature)

Topic: JEE PYQ

Answer: -113. Full step-by-step solution below.