The average number of starfruits in Box V, Box W and Box X is 29 and it is 2 more than the average number of mangosteens in the 3 boxes. ¹₉ of the mangosteens are in Box V and the mangosteens in Box V is 30% of the number of mangosteens in Box W. If each box has the same number of fruits, what percentage of the fruits in Box X are starfruits?
Average number of mangosteens
= 29 - 2
= 27

Total number of mangosteens
= 3 x 27
= 81

Total number of starfruits
= 3 x 29 
= 87

Total number of fruits
= 81 + 87
= 168

Number of fruits in each box
= 168 ÷ 3
= 56

Mangosteens in Box V	Mangosteens in Box W	Mangosteens in Box X	Total mangosteens
1x3	8x3		9x3
3x1	10x1
3 u	10 u	14 u	27 u

30% = ³⁰₁₀₀ = ³₁₀

The number of mangosteens in Box V is repeated.  Make the number of mangosteens in Box V the same.  LCM of 1 and 3 is 3. 

Total number of mangosteens
= 3 u + 10 u + 14 u
= 27 u

27 u = 81

1 u = 81 ÷ 27 = 3

Number of mangosteens in Box X
= 14 u
= 14 x 3
= 42

Number of starfruits in Box X
= 56 - 42
= 14

Percentage of the fruits in Box X are starfruits
= ¹⁴₅₆ x 100%
= 25%

Answer(s): 25%