The average number of apples in Container B, Container C and Container D is 39 and it is 3 more than the average number of mangoes in the 3 containers. ¹₃ of the mangoes are in Container B and the mangoes in Container B is 80% of the number of mangoes in Container C. If each container has the same number of fruits, what percentage of the fruits in Container D are apples?
Average number of mangoes
= 39 - 3
= 36

Total number of mangoes
= 3 x 36
= 108

Total number of apples
= 3 x 39 
= 117

Total number of fruits
= 108 + 117
= 225

Number of fruits in each container
= 225 ÷ 3
= 75

Mangoes in Container B	Mangoes in Container C	Mangoes in Container D	Total mangoes
1x4	2x4		3x4
4x1	5x1
4 u	5 u	3 u	12 u

80% = ⁸⁰₁₀₀ = ⁴₅

The number of mangoes in Container B is repeated.  Make the number of mangoes in Container B the same.  LCM of 1 and 4 is 4. 

Total number of mangoes
= 4 u + 5 u + 3 u
= 12 u

12 u = 108

1 u = 108 ÷ 12 = 9

Number of mangoes in Container D
= 3 u
= 3 x 9
= 27

Number of apples in Container D
= 75 - 27
= 48

Percentage of the fruits in Container D are apples
= ⁴⁸₇₅ x 100%
= 64%

Answer(s): 64%