Cost of Pencils
Date: 6/26/96 at 3:30:9 From: Susan Goh Subject: Algebra Dear Dr. Math, Drawing pencils cost 8 cents each and coloured pencils cost 11 cents each. Two dozen assorted pencils cost $2.16. How many coloured pencils are there? Jean Singapore
Date: 6/26/96 at 6:9:33 From: Doctor Anthony Subject: Re: Algebra Let x = number of 8 cents pencils, then 24-x = number of 11 cents pencils Now we can write down an equation for total cost. 8x + 11(24-x) = 216 8x + 264 - 11x = 216 48 = 3x and so x = 16. Number of drawing pencils = 16. Number of coloured pencils = 8. Check: 8*16 + 11*8 = 216 -Doctor Anthony, The Math Forum Check out our web site! http://mathforum.org/dr.math/
Search the Dr. Math Library:
Ask Dr. MathTM
© 1994- The Math Forum at NCTM. All rights reserved.