Question

Twenty five more than twice a number is fifty five. What is the number?

Answer 1

Explanation:

Note all operations:

• twenty-five more than → addition → +25
• twice a number → multiplication → ×2
• is fifty-five → equal to → =55

Create an equation, and make the unknown number be x. 25 is added to x multiplied by 2, which, in all, equals 55:

`2x+25=55`

Now solve for x. Subtract 25 from both sides:

`2x+25-25=55-25\\\\2x=30`

Divide both sides by 2:

`(2x)/(2)=(30)/(2) \\\\x=15`

The number is equal to 15.

:Done

CHECK:

Insert the value of x to see if it is true:

`2(15)+25=55\\\\30+25=55\\\\55=55`

This is true, so the value of x is also true.

Answer 2

15

Explanation:

15x2 = 30

30+25 = 55