Top cell is multiply and Bottom cell is sum of mid cell's number.

Place the numbers 1 - 12 in the twelve circles below so the sum of each side of the triangle is 36. I will give you a head start by placing some of the numbers for you. (The numbers may be used once only).

5 11 6 9 13 18 11 20 21 25 16 ?

1) 6 , 5 , 43.2 2) 5 , 4 , 31.25 3) 4 , 3 , 21.33 4) 3 , 2 , ?