If 10 be added to four times a certain number, the result is 5 less than five times the number. Find the number.

Question

Philoid · Accepted Answer

Let the number be x

According to the question

10 + 4x = 5x - 5

By cross multiplication

⇒ 5x - 4x = 10 + 5

⇒ x = 15

So the number is 15