Question

11. A student received a 75% on an exam. If there were 20 questions on the exam, which ratio would show the number of questions answered correctly to the total

number of questions?

Answer 1

3:4

Explanation:

We are given a situation where a student received a 75% on an exam. The exam was 20 questions long, then our question is to find the ratio of number of questions answered correctly and the total number of questions.

So let us break this up :

There are 20 questions total on the exam.

The student answered 75% of them correctly

Let us turn the amount he got correct into a fraction

`(75)/(100)`

`(3)/(4)`

Now multiply by 20 to find the amount the student got correct :

`(3)/(4) * 20`

`15`

The student got 15 questions correct.

So our ratio is 15:20

Simplify :

3:4

Answer 2

15/20 or 3:4

Explanation:

is/of = %/100

x/20 = 75/100

cross multiple we get

20 * 75 = 1500

100x = 1500/100 = 15

so he got 15 question right or 3 out of every 4 question!