instruction:
The task is to generate the correct answer for a given math problem.
question:
Problem: what is the total number of integers between 10 and 50 that are divisible by 2 ?
answer:
19

question:
Problem: a man , a woman and a boy can together complete a piece of work in 3 days . if a woman alone can do it in 6 days and a boy alone in 18 days , how long will a man take to complete the work ?
answer:
9 days

question:
Problem: a building contractor employs 20 male , 15 female and 5 child workers . to a male worker he pays rs . 25 per day , to a female worker rs . 20 per day and a child worker rs . 8 per day . the average wage per day paid by the contractor is ?
answer:
21