instruction:
The task is to generate the correct answer for a given math problem.
question:
Problem: how many liters of a 40 % iodine solution need to be mixed with 35 liters of a 20 % iodine solution to create a 34 % iodine solution ?
answer:
13


question:
Problem: a 10 % stock yields 8 % . the market value of the stock is :
answer:
rs . 125


question:
Problem: a flagstaff 17.5 m high casts a shadow of length 40.25 m . the height of the building , which casts a shadow of length 28.75 m under similar conditions will be ?
answer:

12.5 m