Question

find a no. which when multiplied by 5 is increased by 80​

Answer 1

Let the number be x

X x 5 = X + 80

5x = x + 80

5x - x = 80

4x = 80

x = 80/4

x = 20

So , the number is 20 .

Answer 2

We need to find a number which when multiplied by 5 will be increased by 80.

While solving these questions, The unknown quantity must be assigned a variable

What are variables?

1. Variables are alphabets which take any value.

• So, Let the number be x

Number when multiplied by 5 implies

⇒x $\times$ 5

⇒ 5x

• Number increased by 80 implies
• ⇒ x + 80

Question : A number which when multiplied by 5 will be increased by 80.

Since, We have assumed x is the number. The question changes to x when multiplied by 5 is increased by 80

⇒ 5x = x + 80

To find x, unknowns should be on one side of the equation and constants on other side.

Subtracting x from both sides,

⇒ 5x - x = x + 80 - x

⇒ 4x = 80

Dividing by 4 on both sides

⇒ 4x ÷ 4 = 80 ÷ 4

⇒ x = 20

Therefore, The number is 20.

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