There were some lemons, oranges and kiwis. The number of lemons was two times the number of oranges. The total number of lemons and oranges was one-quarter of the number of kiwis. There were 150 fruits altogether. All the kiwis were sold at 4 for $12. How much money was collected from the sale of the kiwis?
Number of oranges = 1 u
Number of lemons = 2 u

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

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

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

Amount collected from the sale of kiwis
= 30 x 12
= $360

Answer(s): $360