There were some apples, passion fruits and oranges. The number of apples was four times the number of passion fruits. The total number of apples and passion fruits was one-quarter of the number of oranges. There were 150 fruits altogether. All the oranges were sold at 4 for $6. How much money was collected from the sale of the oranges?
Number of passion fruits = 1 u
Number of apples = 4 u

Total number of passion fruits and apples
= 1 u + 4 u
= 5 u

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

Number of sets of 4 oranges
= 120 ÷ 4
= 30

Amount collected from the sale of oranges
= 30 x 6
= $180

Answer(s): $180