Question

When 20% of a number is added to 20 , the result is the number again. Find the number ?

   

Answer 1

Let x be the number

Find 20% of the number:

20% of x = 0.2x

Form the equation:

When 20% of a number is added to 20 , the result is the number again

⇒ 0.2x + 20 = x

Solve x:

0.2x + 20 = x

x - 0.2x = 20

0.8x = 20

x = 20 ÷ 0.8 = 25

Answer: The number is 25

Answer 2

Let the number be x

Given,
(20% of x)+ 20= x
=> 80% of x= 20
(°•° x= 100%of x)

(80x/100)= 20
4x= 100
x= 25
The no. required is 25

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verification:
The no. is 25
100% = 25
20%= ?
(Cross Multiply)
20%= (25*20)/100
20%= (1/4)*20=5

20% + 20= 25
Given data matched

;)
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