If a-b=12 and b/2=10, what is the value of a+b?

52.

Step-by-step explanation:

b:2=10 and a-b=12

You work it backwards; dividing becomes multiplying, subtracting becomes adding, multiplying becomes dividing, and adding becomes subtracting.

With that, multiply both sides of the first problem (b:2=10) by 2, then you have b=20.

Plug b into the second equation (a-b=12) then solve.

a-20=12

Add 20

a=32

Because it is asking for the value of a+b, add 20 and 32 and you get 52.