anonymous
  • anonymous
how much sand must be added to250lb of a cement mixture that is 22% sand to have a mixture that is 25% sand?
Mathematics
  • Stacey Warren - Expert brainly.com
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SOLVED
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chestercat
  • chestercat
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amistre64
  • amistre64
250(.22) + n(1.00) = (250+n)(.25)
anonymous
  • anonymous
okay hold on... let me see how you go about it
amistre64
  • amistre64
250(.22) + n = 250(.25) + n(.25) n - n(.25) = 250(.25) - 250(.22) n(1 -.25) = 250(.25 - .22) n = 250 (.25 - .22) / (1 - .25)

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amistre64
  • amistre64
gotta head to class .... good luck :)
anonymous
  • anonymous
igot10

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