There were some kiwis, oranges and mangosteens. The number of kiwis was four times the number of oranges. The total number of kiwis and oranges was half of the number of mangosteens. There were 150 fruits altogether. All the mangosteens were sold at 5 for $8. How much money was collected from the sale of the mangosteens?
Number of oranges = 1 u
Number of kiwis = 4 u

Total number of oranges and kiwis
= 1 u + 4 u
= 5 u

Number of mangosteens
= 2 x 5 u
= 10 u

Total number of fruits
= 1 u + 4 u + 10 u
= 15 u

15 u = 150

1 u = 150 ÷ 15 = 10

Number of mangosteens sold
= 10 u
= 10 x 10
= 100

Number of sets of 5 mangosteens
= 100 ÷ 5
= 20

Amount collected from the sale of mangosteens
= 20 x 8
= $160

Answer(s): $160