Zinc and copper are in the ratio 5 : 3 in 400 gm of an alloy. How much of copper ( in grams) should be added to make the ratio 5 : 4

Zinc and copper are in the ratio 5 : 3 in 400 gm of an alloy. How much of copper ( in grams) should be added to make the ratio 5 : 4
1). 50
2). 66
3). 72
4). 200

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