document.write( "Question 558028: Hanna has $11.20 in a jar that contains only nickels and dimes. There are 140 coins in the jar. How many dimes are in Hanna's jar? \n" ); document.write( "
Algebra.Com's Answer #362876 by saifoo.khan(162)\"\" \"About 
You can put this solution on YOUR website!
Hi,
\n" ); document.write( ":\r
\n" ); document.write( "\n" ); document.write( "Let n be the number of nickels, and d be the number of dimes.
\n" ); document.write( "From the first sentence:
\n" ); document.write( "(1) .05n + .10d = 11.2
\n" ); document.write( "Second sentence:
\n" ); document.write( "(2) n + d = 140
\n" ); document.write( ":
\n" ); document.write( "From equation 2, we subtract n from both sides:
\n" ); document.write( "(3) d = 140 - n
\n" ); document.write( ":
\n" ); document.write( "Substitute (3) into (1):
\n" ); document.write( ".05n + .1 (140 -n) =11.2
\n" ); document.write( ".05n + 14 - .1n = 11.2
\n" ); document.write( "-.05n = -2.8 (Multiply by -20 on both sides)
\n" ); document.write( "n = 56
\n" ); document.write( ":
\n" ); document.write( "Using equation #3:
\n" ); document.write( "d = 140 - 56
\n" ); document.write( "d = 84
\n" ); document.write( ":
\n" ); document.write( "--------------------
\n" ); document.write( "Cheers/
\n" ); document.write( "Saifoo.khan
\n" ); document.write( "einstein.saifoo@gmail.com
\n" ); document.write( " \n" ); document.write( "
\n" );