The average number of mangoes in Box A, Box B and Box C is 44 and it is 8 more than the average number of starfruits in the 3 boxes. ¹₉ of the starfruits are in Box A and the starfruits in Box A is 30% of the number of starfruits in Box B. If each box has the same number of fruits, what percentage of the fruits in Box C are mangoes?
Average number of starfruits
= 44 - 8
= 36

Total number of starfruits
= 3 x 36
= 108

Total number of mangoes
= 3 x 44 
= 132

Total number of fruits
= 108 + 132
= 240

Number of fruits in each box
= 240 ÷ 3
= 80

Starfruits in Box A	Starfruits in Box B	Starfruits in Box C	Total starfruits
1x3	8x3		9x3
3x1	10x1
3 u	10 u	14 u	27 u

30% = ³⁰₁₀₀ = ³₁₀

The number of starfruits in Box A is repeated.  Make the number of starfruits in Box A the same.  LCM of 1 and 3 is 3. 

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

27 u = 108

1 u = 108 ÷ 27 = 4

Number of starfruits in Box C
= 14 u
= 14 x 4
= 56

Number of mangoes in Box C
= 80 - 56
= 24

Percentage of the fruits in Box C are mangoes
= ²⁴₈₀ x 100%
= 30%

Answer(s): 30%