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प्रश्न
An alloy contains only zinc and copper and they are in the ratio of 7:9. If the weight of the alloy is 8 kg, then find the weight of copper in the alloy.
उत्तर
The ratio of the weight of zinc and copper is 7:9.
Let the weight of zinc be 7 : x kg and the weight of copper be 9x kg.
The weight of the alloy = 8 kg
⇒ 7x + 9x = 8
⇒ 16x = 8
⇒ x = `8/16 = 1/2`
So, the weight of copper = `9 xx 1/2` kg = `9/2` kg
= `4 1/2` kg
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