There were some apples, kiwis and mangosteens. The number of apples was two times the number of kiwis. The total number of apples and kiwis was half of the number of mangosteens. There were 180 fruits altogether. All the mangosteens were sold at 8 for $13. How much money was collected from the sale of the mangosteens?
Number of kiwis = 1 u
Number of apples = 2 u

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

Number of mangosteens
= 2 x 3 u
= 6 u

Total number of fruits
= 1 u + 2 u + 6 u
= 9 u

9 u = 180

1 u = 180 ÷ 9 = 20

Number of mangosteens sold
= 6 u
= 6 x 20
= 120

Number of sets of 8 mangosteens
= 120 ÷ 8
= 15

Amount collected from the sale of mangosteens
= 15 x 13
= $195

Answer(s): $195