Fill in the following pattern <br> ____ + 8 = 13 <br> 50 + ____ = 130 <br> 500 + 800 = ____

Question

$\begin{array}{11} (a)\; 7, 70, 700 \\ (b)\; 5, 50, 500 \\ (c)\; 5, 80, 130 \\ (d)\; 5, 80, 1300 \end{array}$