Question

A student earned a grade of 80% on a math test. He answered 20 of the questions correctly. How many problems were on the test?

Answer 1

Answer: 25

Explanation:

Given

The student earned 80% on a math test

The student answered 20 questions

Suppose x is the total no of questions

So, we can write

`\Rightarrow (20)/(x)* 100=80\%\\\Rightarrow (20)/(x)=0.8\\\\\Rightarrow (20)/(0.8)=x\\\\\Rightarrow x=25`

So, there are 25 questions in total