The ratio of copper and zinc in an alloy is $$9: 7$$. If the weight of zinc in the alloy is $$9.8$$ kg, find the weight of copper in the alloy in kg.
Correct option is A. $$12.6$$.
Given,
Weight of zinc in the alloy $$ = 9.8 kg $$
The ratio of copper and zinc in an alloy $$= 9:7$$.
Let,
Weight of copper $$ =9x$$
Weight of zinc $$= 7x$$
$$9.8 = 7x$$
$$x = 1.4 kg$$
$$\therefore$$ Weight of copper in the alloy $$ = 9x$$
$$ = 9(1.4)$$
$$= 12.6 kg$$