instruction:
You are given a math word problem and you are supposed to apply addition or subtraction mathematical operators on the numbers embedded in the text to answer the following question and then only report the final numerical answer.
question:
13 ducks are swimming in a lake . 20 more ducks come to join them . How many ducks are swimming in the lake ?
answer:
33


question:
Suzie found 2 worms in the yard and measured them with a ruler . 1 worm was 0.8 inch long . The other worm was 0.1 inch long . How much longer was the longer worm ?
answer:
0.7


question:
Frank made 5 dollars mowing lawns and 58 dollars weed eating . If he only spent 7 dollar a week , how long would the money last him ?
answer:

9