Question

There are 2 answers for this

(Please use a comma to separate them)

Emma got 90% of the questions on her history test correct if she answered 27 questions correctly, how many questions did Emma get wrong?

There were (A) questions on the test so she got (B) questions wrong

Answer 1

There were 30 questions on the test so she got 3 questions wrong.

Explanation:

Given that:

Correct answers by Emma = 27

Percentage of correct answers = 90%

Let,

x be the total number of questions on test

90% of x = 27

`(90)/(100)x=27`

`0.9x=27`

Dividing both sides by 0.9

`(0.9x)/(0.9)=(27)/(0.9)\\x=30`

There were 30 questions on the test.

Wrong answers = Total questions - Correct answers

Wrong answers = 30-27 = 3

Hence,

There were 30 questions on the test so she got 3 questions wrong.