Riddle #39 (Three upvotes to the first correct answer posted in comments.)

18?

Hint: The three numbers in the squares give you the value of the number in the triangle next to them. The pattern will be the same for all three groups. So, using 2, 3 and 4, how do you arrive at the number 10? These are all addition, subtraction, multiplication, and division.

5?

YES! (Multiply the first two squares then add the third square.)

excitement 10000000*

😀 Now do the other 3.

b e t