Question

What should be added to (-10) to get (+10)​

Answer 1

20

Explanation:

-10 + 20 = +10

Answer 2

`\fbox {20}`

Explanation:

Let the required term be x

Then :

• x + (-10) = 10
• x - 10 = 10
• x = 10 + 10
• x = 20