Ryan gets a gift of $80 on his birthday. He goes to the Lego store to buy Lego sets. The Lego store has small sets for $4, the medium size sets for $16 and the large sets for $32. What is the least number of sets that Ryan can buy if he has to buy at least one small and one medium set of Lego?

Answer 1

1 small + 1 medium = $20
so $60 left
we can only buy one large for $32
60 = 32 = $28 left (3 bought so far)
One medium for 16 leaves 12 (4 so far)
finally 3 smalls leaves $0 (7 total)