There were some pomegranates, apples and lemons. The number of pomegranates was three times the number of apples. The total number of pomegranates and apples was one-third of the number of lemons. There were 160 fruits altogether. All the lemons were sold at 4 for $13. How much money was collected from the sale of the lemons?
Number of apples = 1 u
Number of pomegranates = 3 u

Total number of apples and pomegranates
= 1 u + 3 u
= 4 u

Number of lemons
= 3 x 4 u
= 12 u

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

16 u = 160

1 u = 160 ÷ 16 = 10

Number of lemons sold
= 12 u
= 12 x 10
= 120

Number of sets of 4 lemons
= 120 ÷ 4
= 30

Amount collected from the sale of lemons
= 30 x 13
= $390

Answer(s): $390