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December 21, 2014

December 21, 2014

Posted by **Courtney** on Saturday, November 13, 2010 at 11:22pm.

I dont even know where to begin with this Q.

- Math (hard) -
**Reiny**, Saturday, November 13, 2010 at 11:31pmlet the number of 20 cent stamps be x

then the number of 33 cent stamps is 50-x

solve:

20x + 33(50-x) = 1260

- Math (hard) -
**Alissa**, Saturday, November 13, 2010 at 11:38pmAfter solving the equation i get 3.9=x

??? isnt there a way you can solve it by letting x= number of postcard stamps and then y= number of letter stamps?

- Math (hard) -
**Reiny**, Saturday, November 13, 2010 at 11:46pmsure:

number of postcards stamps x

number of letter stamps y

x + y = 50

20x + 33y = 1260

from the first:: y = 50-x

then in the second

20x + 33(50-x) = 1260

well, look at that! I had that in the first line.

solution:

20x + 1650 - 33x = 1260

-13x = -390

x = 30

then y = 50-x = 50-30 = 20

(how did you get a decimal??? of 3.9x ? )

- Math (hard) -
**Carry**, Saturday, November 13, 2010 at 11:55pmTHANK YOU!!!!!! sorry! i feel like a waste of time for you, but im just not that smart ;)

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