There were some lemons, kiwis and mangoes. The number of lemons was two times the number of kiwis. The total number of lemons and kiwis was one-quarter of the number of mangoes. There were 150 fruits altogether. All the mangoes were sold at 4 for $13. How much money was collected from the sale of the mangoes?
Number of kiwis = 1 u
Number of lemons = 2 u

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

Number of mangoes
= 4 x 3 u
= 12 u

Total number of fruits
= 1 u + 2 u + 12 u
= 15 u

15 u = 150

1 u = 150 ÷ 15 = 10

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

Number of sets of 4 mangoes
= 120 ÷ 4
= 30

Amount collected from the sale of mangoes
= 30 x 13
= $390

Answer(s): $390