There were some apples, mangoes and persimmons. The number of apples was two times the number of mangoes. The total number of apples and mangoes was one-third of the number of persimmons. There were 168 fruits altogether. All the persimmons were sold at 6 for $11. How much money was collected from the sale of the persimmons?
Number of mangoes = 1 u
Number of apples = 2 u

Total number of mangoes and apples
= 1 u + 2 u
= 3 u

Number of persimmons
= 3 x 3 u
= 9 u

Total number of fruits
= 1 u + 2 u + 9 u
= 12 u

12 u = 168

1 u = 168 ÷ 12 = 14

Number of persimmons sold
= 9 u
= 9 x 14
= 126

Number of sets of 6 persimmons
= 126 ÷ 6
= 21

Amount collected from the sale of persimmons
= 21 x 11
= $231

Answer(s): $231