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Nan Hua SA2 Paper 2 Question 13

Mary puts some money in boxes, A,B,C and D. The amount of money in box A is 2/7 of the total amount of money in boxes B,C and D. The amount of money in box B is 2/3 of the total amount of money in boxes A, C and D. The amount of money in box C is 1/3 of the total amount of money in boxes A, B and D. If there is $161 in box D, what is the total amount of money in the four boxes?

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