Question

A student missed 10 problems on a history test and received a grade of 17%. If all the problems were of equal value, how many problems were on the test?

Answer 1

12 problems

Explanation:

All problems were of equal value

Let x be the number of problems in the test

We apply a rule of three

x ------------------------------- 100%

(x-10) --------------------------- 17%

(x-10)*100%/(x) = 17%

(x-10)/(x) = 0.17

(x-10) = 0.17*x

0.83*x = 10

x = 12.05

x = 12 problems