Question

if the compound ratio of 7:5 and 8:x is 83:60 then find X​

Answer 1

The compounded ratio of two ratios $a\div b$ and $c\div d$ is defined as $ac\div bd$.

So, in your case, we have

$\dfrac{7\cdot 8}{5x}=\dfrac{83}{60}$

Solving for $x$ yields

$x=\dfrac{56\cdot 60}{5\cdot 83}=\dfrac{672}{83}$