Question

Although five of John's answers were incorrect, 90% of his answers were correct. How many questions did John answer in all?

Answer 1

John answered 50 questions.

Explanation:

Although five of John's answers were incorrect, 90% of his answers were correct.

This means that 5 is 100 - 90% = 10% of the total number of questions, n. So

`0.1n = 5`

`n = (5)/(0.1)`

`n = 50`

John answered 50 questions.