Question

3. Find a number which when multiplied by 5 is increased by 80.
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Answer 1

Answer:

Solution. Let the required number be x. or, 5x − x = 80 [Transposing x to the L.H.S.] Thus, the required number is 20.

Step-by-step explanation:

Answer 2

Answer:

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?

Variables are alphabets which take any value.

So, Let the number be x

Number when multiplied by 5 implies

⇒x * 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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