Question

10% of ___ is 81
A.) 8.1
B.) 81
C.) 810
D.) 8100

Answer 1

the answer is C, to figure it out take all the numbers and multiply by .10

Answer 2

Answer:

Option C.

Explanation:

Let the unknown number be x.

It means 10% of x is 81.

$x\times \dfrac{10}{100}=81$

$x\times \dfrac{1}{10}=81$

$\dfrac{x}{10}=81$

Multiply both sides by 10 to find the value of x.

$\dfrac{x}{10}\times 10=81\times 10$

$x=810$

The value of x is 810. It means 10% of 810 is 81.

Therefore, the correct option is C.