TASK DEFINITION: The task is to generate the correct answer for a given math problem.
PROBLEM: Problem: set s contains exactly 10 numbers and has an average ( arithmetic mean ) of 6.2 . if one of the numbers in set s is increased by 7 , while all other numbers remain the same , what is the new average of set s ?

SOLUTION: 6.

PROBLEM: Problem: jack and jill are marathon runners . jack can finish a marathon ( 42 km ) in 7 hours and jill can run a marathon in 4.2 hours . what is the ratio of their average running speed ? ( jack : jill )

SOLUTION: 5 / 5

PROBLEM: Problem: a student chose a number , multiplied it by 2 , then subtracted 138 from the result and got 110 . what was the number he chose ?

SOLUTION:
124