TASK DEFINITION: The task is to generate the correct answer for a given math problem.
PROBLEM: Problem: what is the probability of getting a queen or spade from a set of cards ?

SOLUTION: 4 / 13

PROBLEM: Problem: p , q and r together earn rs . 1710 in 9 days . p and r can earn rs . 600 in 5 days . q and r in 7 days can earn rs . 910 . how much amount does r can earn per day ?

SOLUTION: s . 60

PROBLEM: Problem: a is half good a work man as b and together they finish a job in 20 days . in how many days working alone b finish the job ?

SOLUTION:
30 days