



 
Hi Barbra, I'll give you some help on the second problem and then you can finish it and try the first problem. Suppose a cookie cost C dollars and a bar cost B dollars. The first sentence then tells you that
The second sentence then becomes
You can solve the first equation for the cost of a cookie and get
Substitute this value for C into the second equation and you are left with an equation in the single variable B. Solve this equation for B. Penny  


Math Central is supported by the University of Regina and The Pacific Institute for the Mathematical Sciences. 