There were some lemons and mangosteens in Container C and Container D. In Container C, the ratio of the lemons to the number of mangosteens was 4 : 1. In Container D, the ratio of the number of lemons to the number of mangosteens was 3 : 2. There were 3 times as many fruits in Container C as in Container D. After another 70 mangosteens were put into Container D, the ratio of the number of lemons to the number of mangosteens in Container D became 1 : 4. How many fruits were there in Container D in the end?

Container C		Container D
3x5 = 15 u		1x5 = 5 u
Lemons	Mangosteens	Lemons	Mangosteens
4x3	1x3	3	2
12 u	3 u	3 u	2 u

The total number of fruits in Container C is repeated.  Make the total number of fruits in Container C the same.  LCM of 3 and 5 is 15.

The total number of fruits in Container D at first is repeated.  Make the total number of fruits in Container D the same.  LCM of 1 and 5 is 5.

	Container C		Container D
	Lemons	Mangosteens	Lemons	Mangosteens
Before	12 u	3 u	3 u	2 u
Change				+ 70
After	12 u	3 u	1x3 = 3 u	4x3 = 12 u

Number of lemons in Container D remains unchanged.  Make the number of lemons in Container D the same.  LCM of 3 and 1 is 3.

Number of mangosteens put into Container D
= 12 u - 2 u
= 10 u

10 u = 70

1 u = 70 ÷ 10 = 7

Number of fruits in Container D in the end
= 3 u + 12 u
= 15 u
= 15 x 7
= 105

Answer(s): 105