A student missed 13 problems on a chemistry test and received a grade of 41%. If all the questions were of equal value , how many problems were on the test. round to the nearest integer.

Question

A student missed 13 problems on a chemistry test and received a grade of 41%. If all the questions were of equal value , how many problems were on the test. round to the nearest integer.

Answer 1

correct/total x 100% = grade%

correct = total - 13

correct = c

total = t

(t-13)/t x 100% = 41% set up your problem

(t-13)/t = .41 divide by 100%

t-13 = .41t add 13

t = .41t + 13 subtract .41t

.59t = 13 divide by .59

t = 22.03 round to nearest integer

t = 22

Check your answer:

22 total

13 wrong

(22-13)/13 = .41

There are 22 total questions