instruction:
The task is to generate the correct answer for a given math problem.
question:
Problem: if a - b = 6 and a 2 + b 2 = 50 , find the value of ab .
answer:
a ) 7


question:
Problem: a family pays $ 800 per year for an insurance plan that pays 70 percent of the first $ 1,000 in expenses and 100 percent of all medical expenses thereafter . in any given year , the total amount paid by the family will equal the amount paid by the plan when the family ' s medical expenses total how much ?
answer:
$ 1,400


question:
Problem: if a person walks at 20 km / hr instead of 10 km / hr , he would have walked 20 km more . the actual distance traveled by him is :
answer:

20 km