There were some kiwis, lemons and mangosteens. The number of kiwis was two times the number of lemons. The total number of kiwis and lemons was half of the number of mangosteens. There were 162 fruits altogether. All the mangosteens were sold at 4 for $10. How much money was collected from the sale of the mangosteens?
Number of lemons = 1 u
Number of kiwis = 2 u

Total number of lemons and kiwis
= 1 u + 2 u
= 3 u

Number of mangosteens
= 2 x 3 u
= 6 u

Total number of fruits
= 1 u + 2 u + 6 u
= 9 u

9 u = 162

1 u = 162 ÷ 9 = 18

Number of mangosteens sold
= 6 u
= 6 x 18
= 108

Number of sets of 4 mangosteens
= 108 ÷ 4
= 27

Amount collected from the sale of mangosteens
= 27 x 10
= $270

Answer(s): $270