The ratio of weights of tin and zinc in an alloy is $2 : 5$ . How much zinc is there in $31.5 g m$ of alloy?

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Solution

Total weight of the alloy $=$ $31.5 g m$
ratio of weights of tin and zinc in an alloy $=$ $2 : 5$
Weight of Zinc in the alloy $=$ $\frac{5}{2 + 5} \times 31.5 = 22.5 m g$
Hence, amount of zinc in $31.5 g m$ of alloy is $22.5 g m$

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