instruction:
The task is to generate the correct answer for a given math problem.
question:
Problem: what decimal fraction is 90 ml of a litre ?
answer:
. 09


question:
Problem: in one alloy there is 12 % chromium while in another alloy it is 8 % . 35 kg of the first alloy was melted together with 40 kg of the second one to form a third alloy . find the percentage of chromium in the new alloy .
answer:
9.75 %


question:
Problem: a circular swimming pool is surrounded by a concrete wall 4 feet wide . if the area of the wall is 11 / 25 of the area of the pool , then the radius of the pool in feet is ?
answer:

20', 'c ) 9', 'd ) 8', 'e ) 1'