document.write( "Question 655900: Mary has $2.15 in a jar that is entirely made up of dimes and nickles. there are 30 coins total. How many dimes and nickles does she have.
\n" ); document.write( "I can guess and check this problem, but how do I put this into an equation and solve? Thanks
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Algebra.Com's Answer #409291 by Alan3354(69443)\"\" \"About 
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Mary has $2.15 in a jar that is entirely made up of dimes and nickles. there are 30 coins total. How many dimes and nickles does she have.
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\n" ); document.write( "d + n = 30
\n" ); document.write( "10d + 5n = 215
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