Question

Jill got an 85% on a math test if there were 40 questions in total,how many did she get wrong?

Answer 1

Yeah she got 6 questions wrong

Answer 2

You can solve this by setting up a proportion. You can put the number of items correct over the total number. and substitute the unknown number with x.

$\frac{85}{100}$ = $\frac{x}{40}$   Cross-multiply
3400 = 100x   Divide both sides by 100
34 = x

40 - 34 = 6

So, Jill got 6 questions wrong.