There were some mangosteens, persimmons and oranges. The number of mangosteens was three times the number of persimmons. The total number of mangosteens and persimmons was one-third of the number of oranges. There were 160 fruits altogether. All the oranges were sold at 8 for $6. How much money was collected from the sale of the oranges?
Number of persimmons = 1 u
Number of mangosteens = 3 u

Total number of persimmons and mangosteens
= 1 u + 3 u
= 4 u

Number of oranges
= 3 x 4 u
= 12 u

Total number of fruits
= 1 u + 3 u + 12 u
= 16 u

16 u = 160

1 u = 160 ÷ 16 = 10

Number of oranges sold
= 12 u
= 12 x 10
= 120

Number of sets of 8 oranges
= 120 ÷ 8
= 15

Amount collected from the sale of oranges
= 15 x 6
= $90

Answer(s): $90