Question

When 81is added to 63% of a number we get 72% of the same number what is 12% of that number?

Answer 1

Answer:

108.

Step-by-step explanation:

Let x be the  number.

81 is added to 63% of a number we get 72% of the same number

81 + 0.63x = 0.72x

=> 0.09x = 81

=> x = 900.

Thus the number is 900.

Now 12% of the number = 12/100 * 900 = 108.

Answer 2

Let, the number be, 'x'

72% of x =(x*72/100)

               = 72x/100

63% of x =(x*63/100)

              = 63x/100

According to the given condition,

$(63x/100)+81 = 72x/100\\⇒(8100+63x)/100 = 72x/100\\⇒ 8100+63x=72x\\⇒8100 = 72x-63x\\⇒9x= 8100\\⇒ x = 8100/9\\⇒ x = 900$

So, the number is 900

∴ 12% of 900

$=(900*12/100)\\=9*12\\=108$

(Ans): 12% of the number is 108.