Question

Five times the sum of a number and two is 25 find the number

Answer 1

5 is the answer because 5•5= 25

Answer 2

Let the number be x.

"Five times the sum of a number and two is 25" means :

$5\cdot(x+2)=25$

We ask ourself: 5 times "what" equals 25?, it is 5 times 5, 

so x+2 must be 5. This means x must be 3.


Answer : 3


Remark: to solve the equation we could have divided both sides by 5 and solve x+2=5

OR we could have distributed 5 to x and 2, and solve 5x+10=25