There were some kiwis, mangosteens and apples. The number of kiwis was four times the number of mangosteens. The total number of kiwis and mangosteens was half of the number of apples. There were 180 fruits altogether. All the apples were sold at 8 for $12. How much money was collected from the sale of the apples?
Number of mangosteens = 1 u
Number of kiwis = 4 u

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

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

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

Amount collected from the sale of apples
= 15 x 12
= $180

Answer(s): $180