A student missed 45 problems on a mathematics test and received a grade of 39%. If all the problems were of equal value, how many problems were on the test?

Answer 1

(T-45)/T = .39 where T = total number of questions

T-45 = .39T

.61T = 45

T = 45/.61 = about 74

74-45 = 29 correct answers

29/74= about 39%