Eliza has collected nickels and dimes worth a total of $\$6.30$ . If she has collected $70$ coins in all and each is worth face value, how many of each kind does she have ?

Question

$\begin{array}{1 1} a)\;Nickels =14, dimes =56 \\ b)\;Nickels =56, dimes =14\\ c)\;Nickels =60, dimes =10 \\ d)\;Nickels =10, dimes =70 \end{array}$