Homework Help: Math

Posted by Megan Brown on Monday, January 31, 2011 at 11:38am.

How would you work, and solve this problem?

Christa is a waitress and collects her tips at the table. At the end of the shift she has 68 bills, all ones and fives. If the total value of her tips is 172, how many of each bill does she have?

Math - helper, Monday, January 31, 2011 at 12:35pm
n = number of ones
1n = value of ones
68 - n = number of fives
5(68 - n) = value of fives

n + 5(68 - n) = 172
n + 340 - 5n = 172
-4n = -168
n = 42

n = 42 ones = 42.00
68 - n = 26 fives = 130.00
68 bills = 172

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