Question

17. A number when multiplied by 5 is increased by 80. The number is
(a) 15
(b) 20
​

Answer 1

➤ Answer

• The number = 20 (option b )

➤ Given

• A number when multiplied by 5 is increased by 80.

➤ To Find

• The number.

➤ Step By Step Explanation

Given that - a number when multiplied by 5 is increased by 80.

We need to find the number.

So let's do it !!

Assumption

Let us consider the number be x.

According to the statement equation will be ⤵

Equation

➠ 5x = x + 80

Solution of equation

➠ 5x = x + 80

➠ 5x - x = 80

➠ 4x = 80

➠ x = 80/4

➠ x = 20

Therefore the number = 20.

____________________

➤ Proof

By substituting the value of x.

L. H. S. ⤵

➠ 5 × 20 = 100

R. H. S. ⤵

➠ 20 + 80 = 100

Hence, L.H.S. = R.H.S.

_____________________