Question

The ratio of zinc and copper in an alloy is $7:9$.If the weight of the copper in the alloy is $11.7$kg. Find the weight of the zinc in the alloy.

Answer 1

Given that,

Weight of zinc $=7x$

Weight of copper $=9x$

Total weight of alloy

$7x+9x=11.7kg$

$x=1.3kg$

Hence,

Weight of zinc $=7\times 1.3=9.1kg$