Question

What must be added to 3 by 5 to get 2 by 9

Answer 1

Let the other no. be x

$\huge\frac\red{3}\purple{5}$ + $\huge\red{x}$ = $\huge\frac\purple{2}\red{9}$

$\huge\purple{x}$ = $\huge\frac\red{2}\purple{9}$ - $\huge\frac\red{3}\purple{5}$

$\huge\red{x}$ = $\huge\frac\purple{10 - 27}\red{45}$

$\huge\purple{x} = \huge\frac\red{-17}\purple{45}$