document.write( "Question 1005780: Tim's piggy bank contains dimes and nickels worth $6.15. He has 77 coins in all. How many of each coin does Tim have? \n" ); document.write( "
Algebra.Com's Answer #621936 by fractalier(6550)![]() ![]() You can put this solution on YOUR website! Call the number of dimes and nickels, d and n. Then we have \n" ); document.write( "d + n = 77 and the value equation is \n" ); document.write( "10d + 5n = 615 (we work in cents) \n" ); document.write( "Now multiply the top equation by five and subtract from the second... \n" ); document.write( "10d + 5n = 615 \n" ); document.write( "-(5d + 5n = 385) \n" ); document.write( "--------------------- \n" ); document.write( "5d = 230 \n" ); document.write( "d = 46 dimes \n" ); document.write( "n must be 31 nickels \n" ); document.write( " |