Question

what must be added to 9 to make it 30???​

Answer 1

Answer:

21

Step-by-step explanation:

9+21=30

Hope it helped

Answer 2

Answer:

Let us consider,

x added to 9 gives us 30

9 + x = 30

x = 30 - 9

x = 21

Therefore, 21 must be added to 9 to make it 30