Question

What should be added to sum of -12 and -21 to get 43​

Answer 1

Answer:

76

Step-by-step explanation:

Let the third number be x.

(-12) + (-21) + x = 43

-12 -21 + x = 43

-33 + x = 43

x = 43 + 33

x = 76

So the number which should be added to the sum of -12 and -21 to get 43 is 76.