The task is to generate the correct answer for a given math problem.

[EX Q]: Problem: a no . when divided by 281 gives a remainder 160 , what remainder will be obtainedby dividingthe same no . 21 ?
[EX A]: 21

[EX Q]: Problem: a man buys 60 pens at marked price of 46 pens from a whole seller . if he sells these pens giving a discount of 1 % , what is the profit percent ?
[EX A]: 29.13 %

[EX Q]: Problem: the average weight of a , b and c is 45 kg . if the average weight of a and b be 40 kg and that of b and c be 47 kg , then the weight of b is :
[EX A]:
39 kg