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

[EX Q]: Problem: in 1950 , richard was 4 times as old as robert . in 1955 , richard was 3 times as old as robert . in which year was richard 1.5 times as old as robert ?
[EX A]: 200

[EX Q]: Problem: if one - third of one - fourth of a number is 18 , then 3 - tenth of that number is : a . 35
[EX A]: 64.8

[EX Q]: Problem: a fruit seller had some oranges . he sells 40 % oranges and still has 420 oranges . how many oranges he had originally ?
[EX A]:
700