In the circuit shown five resistors are connected. The equivalent resistance between X & Y is ?​

Dear student,
Find the answer to your query as under:


 The above circuit is a classical example of wheatstones bridge and thus the current flowing through the resistance in the middle will be 0.

Now, 

the above can be simplified in two steps as under:


 
and finally since the above two resistors are in series with each other and so are the ones below with each other. But then after the combination the two of them are in parallel as shown under: 



Now, 
R_eq = $\frac{R_1\times R_2}{R_1+R_2} = \frac{400}{40} = 10\Omega$


Regards
Satyendra Singh