Question

What number must be added to – 35 to get – 20.

Answer 1

$\underbrace\mathrm\blue{Answer}$

$= > - 35 + x = - 20 \\ = > x = - 20 + 35 \\ = > x = 15 \\ \\ \\ \\ = > - 35 + 15 = - 20$

hope it's helpful to you

Answer 2

$\red{Answer:- }$

Let the number be 'x'.

Equation:-

$- 35 + x = - 20$

$x = - 20 + 35$

$x = 15 \: \red\checkmark$