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

[EX Q]: Problem: the sum of ages of 5 children born 1 years different each is 30 years . what is the age of the elder child ?
[EX A]: 8

[EX Q]: Problem: each of the products produced yesterday was checked by worker x or worker y . 0.5 % of the products checked by worker x are defective and 0.8 % of the products checked by worker y are defective . if the total defective rate of all the products checked by worker x and worker y is 0.74 % , what fraction of the products was checked by worker y ?
[EX A]: 4 / 

[EX Q]: Problem: raman mixed 48 kg of butter at rs . 150 per kg with 36 kg butter at the rate of rs . 125 per kg . at what price per kg should he sell the mixture to make a profit of 40 % in the transaction ?
[EX A]:
195