Question

What number should be divided by (0.81)^1/2 to give 81?

Answer 1

Answer:

it should be divided by 810

Answer 2

Answer:

Step-by-step explanation:

Let number be  X

if  X  is divided by (0.81)^1/2  to give the result as 81.

So,  X / (0.81)½ = 81

here, 0.81 = 0.9 × 0.9 = (0.9)²

we can write  (0.81)½

as (0.9²)½ = 0.9

then ,  X/0.9 = 81

therefore , X = 0.9 × 81 = 72.9