anonymous
  • anonymous
colored copies cost .10 cents white copies cost .5cents sandy make 400 copies , some of which were colored and the rest white. her total was $22.50. how many colored copies and how many white did she made?
Mathematics
  • Stacey Warren - Expert brainly.com
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SOLVED
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katieb
  • katieb
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myininaya
  • myininaya
let colored copies be represented by C let white copies be represented by W .10C+.5W=22.50 C+W=400
myininaya
  • myininaya
sine C+W=400, then W=400-C. so .10C+.5(400-C)=22.50 .10C+200-.5C=22.50 -.4C+200=22.50 -.4C=22.50-200=-177.5 C=-177.5/(-.4)=443.75 But thats impossible since Sandy only made 400 copies
myininaya
  • myininaya
did you mean white copies cost .5 cents or .05 cents?

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anonymous
  • anonymous
.05 cents
myininaya
  • myininaya
ok so we have .10C+.05W=22.50 C+W=400 implies W=400-C so .10C+.05(400-C)=22.50 .10C+20-.05C=22.50 .05C+20=22.50 .05C=22.50-20=2.5 C=2.5/(.05)=50 since W=400-C, then W=400-50=350
anonymous
  • anonymous
i did it like this..c+w=400 .10c+5w=22.50 multiply#1 equation by .10 .10c-10w=17.50 add#3 equation and #2 400c=17.50 c=228 w+228=400
anonymous
  • anonymous
but it doesn't match with the price:(
myininaya
  • myininaya
ok did you understand how I got W=350 and C=50?
anonymous
  • anonymous
no how???
myininaya
  • myininaya
C+W=400 I solved for W and got W=400-C then I plugged this into the other equation
anonymous
  • anonymous
ok now i got it thank you you save me from failing algebra :)
myininaya
  • myininaya
lol k
anonymous
  • anonymous
i got another ???
anonymous
  • anonymous
an airplane flew for 5 hours with a tail wind of 25km/h. The return flight against the same wind took 5.5 hours. find the speed of the plane in still air

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