The task is to generate the correct answer for a given math problem.
--------
Question: Problem: the average weight of a , b and c is 60 kg . if the average weight of a and b be 70 kg and that of b and c be 50 kg , then the weight of b is :

Answer: 60 kg


Question: Problem: after decreasing 24 % in the price of an article costs rs . 684 . find the actual cost of an article ?

Answer: 900


Question: Problem: an amount of money is to be distributed among faruk , vasim and ranjith in the ratio 3 : 5 : 7 . if vasims share is rs . 1500 , what is the difference between faruk ' s and ranjith ' s shares ?

Answer:
rs 1200