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Thank you teacher. Your answer is so clear, I understand very well. So grateful to you.
Work backwards. Internal transfer. Total unchanged.
B : C : D : Total
2 : 2 : 2
1 : 2 : 3
1 : 3 : 2
2 : 6 : 4
3 : 5 : 4 : 12
300 : 500 : 400 : 1200
Ans: 500
B : C : D : Total
2 : 2 : 2
1 : 2 : 3
1 : 3 : 2
2 : 6 : 4
3 : 5 : 4 : 12
300 : 500 : 400 : 1200
Ans: 500