Question

Three times a number added to 8 gives 20. Find the number.

Answer 1

Let the required number be x.
Three times this number is 3x.
On adding 8, the number becomes 3x + 8.
3x + 8 = 20
or, 3x + 8 − 8 = 20 − 8 [Subtracting 8 from both the sides]
or, 3x = 12
or, `(3x)/3=12/3` [Dividing both the sides by 3]
or, x = 4
∴ Required number = 4