instruction:
You are given a math word problem and you are supposed to apply multiplication or division mathematical operators on the numbers embedded in the text to answer the following question and then only report the final numerical answer.
question:
Mark 's father gave him $ 85 . Mark bought 10 books , each of which cost $ 5 . How much money does Mark have left ?
answer:
35


question:
Lisa rented 4 DVDs for $ 4.8 . How much did each DVD cost to rent ?
answer:
1.2


question:
While digging through her clothes for ice cream money , Joan found 15 dimes in her jacket , and 4 dimes in her shorts . How much money did Joan find ?
answer:

1.9