There were some starfruits, kiwis and persimmons. The number of starfruits was three times the number of kiwis. The total number of starfruits and kiwis was one-quarter of the number of persimmons. There were 180 fruits altogether. All the persimmons were sold at 4 for $8. How much money was collected from the sale of the persimmons?
Number of kiwis = 1 u
Number of starfruits = 3 u

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

Number of persimmons
= 4 x 4 u
= 16 u

Total number of fruits
= 1 u + 3 u + 16 u
= 20 u

20 u = 180

1 u = 180 ÷ 20 = 9

Number of persimmons sold
= 16 u
= 16 x 9
= 144

Number of sets of 4 persimmons
= 144 ÷ 4
= 36

Amount collected from the sale of persimmons
= 36 x 8
= $288

Answer(s): $288