There were some starfruits, mangoes and passion fruits. The number of starfruits was four times the number of mangoes. The total number of starfruits and mangoes was half of the number of passion fruits. There were 180 fruits altogether. All the passion fruits were sold at 8 for $8. How much money was collected from the sale of the passion fruits?
Number of mangoes = 1 u
Number of starfruits = 4 u

Total number of mangoes and starfruits
= 1 u + 4 u
= 5 u

Number of passion fruits
= 2 x 5 u
= 10 u

Total number of fruits
= 1 u + 4 u + 10 u
= 15 u

15 u = 180

1 u = 180 ÷ 15 = 12

Number of passion fruits sold
= 10 u
= 10 x 12
= 120

Number of sets of 8 passion fruits
= 120 ÷ 8
= 15

Amount collected from the sale of passion fruits
= 15 x 8
= $120

Answer(s): $120