There were some starfruits, chikoos and mangoes. The number of starfruits was three times the number of chikoos. The total number of starfruits and chikoos was half of the number of mangoes. There were 156 fruits altogether. All the mangoes were sold at 4 for $13. How much money was collected from the sale of the mangoes?
Number of chikoos = 1 u
Number of starfruits = 3 u

Total number of chikoos and starfruits
= 1 u + 3 u
= 4 u

Number of mangoes
= 2 x 4 u
= 8 u

Total number of fruits
= 1 u + 3 u + 8 u
= 12 u

12 u = 156

1 u = 156 ÷ 12 = 13

Number of mangoes sold
= 8 u
= 8 x 13
= 104

Number of sets of 4 mangoes
= 104 ÷ 4
= 26

Amount collected from the sale of mangoes
= 26 x 13
= $338

Answer(s): $338