Every evening Jenna empies her pockets and puts her change in a jar. At the end of the week she counts her money. One week she had 40 coins, all of them dimes and quarters. When she added them up, she had a total of $7.75.
d= number of dimes
q= number of quarters
How many quarters did Jenna have?

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d+q=40 but I don't know what to do next

\[( d + q = 40, 10 d + 25 q = 775 )\]

The second equation concerns pennies.
{ d -> 15, q -> 25 }

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