Which fraction is subject from711 to get the answer as as three upon a seven

Hello Sachin

Then let the fraction be $x$ .

$\frac{7}{11}-x=\frac{3}{7}$

So,

$x=\frac{7}{11}-\frac{3}{7}$

Find a common denominator:

$\frac{7}{11}=\frac{49}{77},\frac{3}{7}=\frac{33}{77}$

Now subtract:

$x=\frac{49}{77}-\frac{33}{77}=\frac{16}{77}$

Answer: $\frac{16}{77}$