There were some mangosteens, starfruits and apples. The number of mangosteens was four times the number of starfruits. The total number of mangosteens and starfruits was one-quarter of the number of apples. There were 150 fruits altogether. All the apples were sold at 5 for $11. How much money was collected from the sale of the apples?
Number of starfruits = 1 u
Number of mangosteens = 4 u

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

Number of apples
= 4 x 5 u
= 20 u

Total number of fruits
= 1 u + 4 u + 20 u
= 25 u

25 u = 150

1 u = 150 ÷ 25 = 6

Number of apples sold
= 20 u
= 20 x 6
= 120

Number of sets of 5 apples
= 120 ÷ 5
= 24

Amount collected from the sale of apples
= 24 x 11
= $264

Answer(s): $264