There were some mangoes, apples and lemons. The number of mangoes was two times the number of apples. The total number of mangoes and apples was one-quarter of the number of lemons. There were 165 fruits altogether. All the lemons were sold at 6 for $9. How much money was collected from the sale of the lemons?
Number of apples = 1 u
Number of mangoes = 2 u

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

Number of lemons
= 4 x 3 u
= 12 u

Total number of fruits
= 1 u + 2 u + 12 u
= 15 u

15 u = 165

1 u = 165 ÷ 15 = 11

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

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

Amount collected from the sale of lemons
= 22 x 9
= $198

Answer(s): $198