There were some mangoes, oranges and kiwis. The number of mangoes was four times the number of oranges. The total number of mangoes and oranges was half of the number of kiwis. There were 180 fruits altogether. All the kiwis were sold at 8 for $6. How much money was collected from the sale of the kiwis?
Number of oranges = 1 u
Number of mangoes = 4 u

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

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

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

Amount collected from the sale of kiwis
= 15 x 6
= $90

Answer(s): $90