Dev has few yellow coins and few red coins. He distributes them equally in two boxes. He puts 6 yellow and 7 red coins in one box. He puts 8 red coins in another box. What is the number of yellow coins he puts in the second box.

Question

$\begin{array}{11} (a)\; \text{6 coins } \\ (b)\; \text{7 coins} \\ (c)\; \text{4 coins} \\ (d)\; \text{ 5 coins} \end{array}$