There were some starfruits, oranges and persimmons. The number of starfruits was three times the number of oranges. The total number of starfruits and oranges was one-third of the number of persimmons. There were 176 fruits altogether. All the persimmons were sold at 6 for $15. How much money was collected from the sale of the persimmons?
Number of oranges = 1 u
Number of starfruits = 3 u

Total number of oranges and starfruits
= 1 u + 3 u
= 4 u

Number of persimmons
= 3 x 4 u
= 12 u

Total number of fruits
= 1 u + 3 u + 12 u
= 16 u

16 u = 176

1 u = 176 ÷ 16 = 11

Number of persimmons sold
= 12 u
= 12 x 11
= 132

Number of sets of 6 persimmons
= 132 ÷ 6
= 22

Amount collected from the sale of persimmons
= 22 x 15
= $330

Answer(s): $330