anonymous
  • anonymous
when mary emptied her bank she found that she had 84 coins,all nickels and dimes. The value of the coins was $7.15. How many dimes did she have. can i see the process thanks
Mathematics
  • Stacey Warren - Expert brainly.com
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SOLVED
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katieb
  • katieb
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radar
  • radar
Let x =dimes Let 84-x =nickels
radar
  • radar
10x+5(84-x)=715 10x+420-5x=715 5x=295 x=59 dimes 84-59=25 nickels proof 5.90+1.25=7.15 59+25=84 coins
radar
  • radar
Is there any part you do not understand?

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anonymous
  • anonymous
why is X dimes and not the nickels
radar
  • radar
an arbitrary choice on my part. I could of just as easy chose x to represent the number of nickels. Then 84-x would of been the dimes. However the following equations would of been changed to represent the different values the revised equation would of been: 5x+10(84-x) = 715
radar
  • radar
Comprehendo?
anonymous
  • anonymous
i understand, thanks alot
radar
  • radar
Great. Remember you are in charge solving equations, but be consistent and logical.
anonymous
  • anonymous
Yes i will remember

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