Question

2.5 is 10% of what number?

Answer 1

2.5=10/100x

Simplify

2.5=1/10x

Flip the equation.

1/10x=2.5

Multiply both sides by 10.

10*(1/10x)=(10)*(2.5)

x=25

Answer 2

is means equal
of means multiplication

so we get

$2.5 = \frac{10}{100} \times n \\ 2.5 = .1 \times n \\ n = 25$

Hope that helps :)