Question 1013327
let x = no. of questions on the test
if he missed 38% that means got 100 - 38 = 62% right
{{{((x-28))/x}}} = .62
multiply both sides by x
x - 28 = .62x
x - .62x = 28
.38x = 28
x = 28/.38
x = 74 questions
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Check {{{((74-28))/74}}} * 100 = .62 ~ 62% right (38% wrong)