There were some chikoos, kiwis and mangosteens. The number of chikoos was four times the number of kiwis. The total number of chikoos and kiwis was half of the number of mangosteens. There were 180 fruits altogether. All the mangosteens were sold at 5 for $10. How much money was collected from the sale of the mangosteens?
Number of kiwis = 1 u
Number of chikoos = 4 u

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

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

Number of sets of 5 mangosteens
= 120 ÷ 5
= 24

Amount collected from the sale of mangosteens
= 24 x 10
= $240

Answer(s): $240