A 100 G Glass Container Contains 250 G of Water

A 100 g glass container contains 250 g of water at 15.0 °C. A 20.0 g piece of lead at 100 °C is added to the water in the container. What is the final temperature of the system in °C? (specific heat of water = 1.00 cal/g °C, specific heat of glass = 0.200 cal/g °C, specific heat of lead = 0.0310 cal/g °C)

A) 10.1
B) 15.2
C) 25.0
D) 31.4
E) 46.3