Question

a number whose double is 45 greater than its half is?

Answer 1

let the number be x

therefore 2x=45+x/2

=2x-x/2=3x/2=45

x=45*2/3=30

therefore the number is 30

hope u understood it

:)

Answer 2

Let the number be x.
Given,
$2x = \frac{x}{2} + 45 \\ 2x - \frac{x}{2} = 45 \\ \frac{3x}{2} = 45 \\ x = \frac{45 \times 2}{3} = 30$