okay
You have 3 fishing poles at the top which equal 30 in total since they are the same object, you know that they have to be the same number..,.
30/3 = 10
Now you have a fishing pole and 2 fish
Now you know that the fishing pole = 10
So the fish have to equal 1 each in order for you to get 12
10+1+1 = 12
The fish hook should equal 7 each
You have 2 hooks + a fish = 15
By now we know that a fish = 1 so 15-1 =14
Now divide 14 by 2 = 7
Following PEMDAS, you should multiply first.
Fishing pole * fish
(AKA) 10 * 1 = 11
+ fish hook (AKA 7)
11 + 7 = 18
