by Anjali
(Delhi)
According to question :
G = 19W
Cu = 9W
Now let required ratio of gold and copper(G and Cu) be
G/Cu = x
So, xCu + Cu/W = 15
Cu(1+x) = 15W
9W(1+x) = 15w
1+x = 15/9
x = 15/9 - 1 = 6/9 = 2/3
So answer is not 3/2 but 2/3.
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