Question

Seven times a number is 20
more than five times that
number. Find the number.

Answer 1

Answer: 10

Explanation:

`7a-20=5a\\7a-20-5a=5a-5a\\2a-20=0\\2a-20+20=0+20\\2a=20\\`

Divide both parts of the equation by 2:

`a=10`