Question

9. (a) 5 x 16 = 80,50 80 is a
of 5 and 16.​

Answer 1

multiple

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Answer 2

Step-by-step explanation:

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.