There were some mangosteens, mangoes and starfruits. The number of mangosteens was five times the number of mangoes. The total number of mangosteens and mangoes was one-quarter of the number of starfruits. There were 150 fruits altogether. All the starfruits were sold at 6 for $14. How much money was collected from the sale of the starfruits?
Number of mangoes = 1 u
Number of mangosteens = 5 u

Total number of mangoes and mangosteens
= 1 u + 5 u
= 6 u

Number of starfruits
= 4 x 6 u
= 24 u

Total number of fruits
= 1 u + 5 u + 24 u
= 30 u

30 u = 150

1 u = 150 ÷ 30 = 5

Number of starfruits sold
= 24 u
= 24 x 5
= 120

Number of sets of 6 starfruits
= 120 ÷ 6
= 20

Amount collected from the sale of starfruits
= 20 x 14
= $280

Answer(s): $280