There were some oranges, mangoes and persimmons. The number of oranges was three times the number of mangoes. The total number of oranges and mangoes was half of the number of persimmons. There were 168 fruits altogether. All the persimmons were sold at 4 for $7. How much money was collected from the sale of the persimmons?
Number of mangoes = 1 u
Number of oranges = 3 u

Total number of mangoes and oranges
= 1 u + 3 u
= 4 u

Number of persimmons
= 2 x 4 u
= 8 u

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

12 u = 168

1 u = 168 ÷ 12 = 14

Number of persimmons sold
= 8 u
= 8 x 14
= 112

Number of sets of 4 persimmons
= 112 ÷ 4
= 28

Amount collected from the sale of persimmons
= 28 x 7
= $196

Answer(s): $196