7+5= 12 ones. Or one ten and 2 ones. They made 12.
Answer:
not sure if you're looking for an example of this or not but if you are then it could be something like 12 + 8 because 2/3 of 12 is 8.
18=r/2
Multiply by 2 on each side,
36=r
r=36
Hope this helps.