There were some mangoes, persimmons and apples. The number of mangoes was three times the number of persimmons. The total number of mangoes and persimmons was one-third of the number of apples. There were 176 fruits altogether. All the apples were sold at 6 for $10. How much money was collected from the sale of the apples?
Number of persimmons = 1 u
Number of mangoes = 3 u

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

Number of apples
= 3 x 4 u
= 12 u

Total number of fruits
= 1 u + 3 u + 12 u
= 16 u

16 u = 176

1 u = 176 ÷ 16 = 11

Number of apples sold
= 12 u
= 12 x 11
= 132

Number of sets of 6 apples
= 132 ÷ 6
= 22

Amount collected from the sale of apples
= 22 x 10
= $220

Answer(s): $220