Question

Abe has a bag of marbles and wants to divide them into sets. The first set will have 2 marbles; the second set, 5; the third set, 8; the fourth set, 11; and so on. How many sets will he have if he starts with 40 marbles?

Answer 1

2 + 5 = 7

7 + 8 = 15

15 +11 = 26

11+3 = 14

26 + 14 = 40

so he has 5 sets