instruction:
The task is to generate the correct answer for a given math problem.
question:
Problem: 20 is subtracted from 80 % of a number , the result is 60 . find the number ?
answer:
100


question:
Problem: a man can do a piece of work in 7 days , but with the help of his son , he can finish it in 3 days . in what time can the son do it alone ?
answer:
4 1 / 5


question:
Problem: simplify : 3005 - 3000 + 10
answer:

2705