What should be subtracted from 50 to get 34.57?

Let the required number be x

50 - x = 34.57

x = 50 - 34.57

Converting the given decimals into like decimals, we have to subtract 34.57 from 50.00.

Subtracting columnwise, we get:

$\begin{array}{r} 50.00 \ -34.57 \ \hline 15.43 \ \hline \end{array}$

Hence, the answer is 15.43