Question

find a number whose double is 45 greater than its half
​

Answer 1

2x = x/2 + 45

==> 2x - x/2 = 45

<==> (3x)/2 = 45

==> 3x = 90

==> x = 90/3 = 30, the unknown number.

Answer 2

$\huge{ \underline{ \mathrm{ \red{Answer}}} \: }$

• ${ \sf{let \: the \: number \: be }} = x$

so,

• $2x = \frac{x}{2} + 45$

• $2x - \frac{x}{2} = 45$

• $\frac{3x}{2} = 45$

• $3x = 90$

• $x = \frac{90}{3}</strong><strong> </strong><strong>= </strong><strong>3</strong><strong>0</strong><strong>$

$\bf{ \color{blue}{30 \: is \: unknown \: number}}$