There were some starfruits, passion fruits and mangoes. The number of starfruits was three times the number of passion fruits. The total number of starfruits and passion fruits was half of the number of mangoes. There were 168 fruits altogether. All the mangoes were sold at 8 for $9. How much money was collected from the sale of the mangoes?
Number of passion fruits = 1 u
Number of starfruits = 3 u

Total number of passion fruits and starfruits
= 1 u + 3 u
= 4 u

Number of mangoes
= 2 x 4 u
= 8 u

Total number of fruits
= 1 u + 3 u + 8 u
= 12 u

12 u = 168

1 u = 168 ÷ 12 = 14

Number of mangoes sold
= 8 u
= 8 x 14
= 112

Number of sets of 8 mangoes
= 112 ÷ 8
= 14

Amount collected from the sale of mangoes
= 14 x 9
= $126

Answer(s): $126