There were some apples, mangosteens and persimmons. The number of apples was four times the number of mangosteens. The total number of apples and mangosteens was half of the number of persimmons. There were 180 fruits altogether. All the persimmons were sold at 8 for $10. How much money was collected from the sale of the persimmons?
Number of mangosteens = 1 u
Number of apples = 4 u

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

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

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

Amount collected from the sale of persimmons
= 15 x 10
= $150

Answer(s): $150