Duke and donna each have 10 coins. all coins are either dimes or quarters. duke has 5 quarters. donna has 60 c more than duke. how many quarters does donna have?

If duke has 5 quarters that means he has 5 dimes making a total of $1.75 
if donna has 60 cents more than him she has a total of $2.35 
to figure out the number of quarters she has just dived $2.35 by .25 cents 
she has 9 quarters and 1 dime.