What is specific heat capacity? You should know its meaning to answer the question. Specific heat capacity is the amount of energy needed to raise the temperature of one kilogram of a substance by one Kelvin.
This question is rather a question of physics. Anyway, work out the amount of energy needed to decrease the temperature from 35 to 15 degrees Celsius (or you can convert it to Kelvin if you want, but the answer will be the same).
This energy is for 250 g. So by proportion, work out the amount of energy needed for one kilogram, or 1000 g.
Hope it helped.
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