By how much does the sum of 15.453 and 31.647 exceed the sum of 18.47 and 19.506?

First sum = 15.453 + 31.647

$\begin{array}{r} \phantom{+}15.453 \ +\space 31.647 \ \hline 47.100 \end{array}$

Second sum = 18.47 + 19.506

Converting into like decimals, we get 18.470 and 19.506.

$\begin{array}{r} \phantom{+}18.470 \ +\space 19.506 \ \hline 37.976 \end{array}$

Required difference = 47.100 - 37.976

$\begin{array}{r} \phantom{+}47.100 \ -\space 37.976 \ \hline 9.124 \end{array}$

Hence, the sum of 15.453 and 31.647 exceeds the sum of 18.47 and 19.506 by 9.124.