math
posted by Miranda .
Cathy and Judy bought some postcard packets.altogether there were 48 cards.Cathy bought three packets with 8 cards each.The packets Judy bought had 12 cardsin each.how many packets did Judy buy.

Cathy bought 24 cards. That leaves 24 cards for Judy. 24/12 = 2

X = cards Cathy bought
Y = cards Judy bought
X + Y = 48
If Cathy only bought three packets of 8, X = 24
So that means Y = 24, and Cathy bought 24 also. How many packets of 12 is that? 
Ceicl has a Mysterious Money Machine that will double any amount of money placed in it and add $5.00 to the doubled amount.Yesterday,Cecil placed a certin amount the box,got a new amount of money,and placed the new amount back in the box.then he had $51.00.How much money did he first place in the Mysterious Money Machine?

To complete drwls' answer:
12 x 24 = 288 for Judy
Done! 
a woman bought some large frames for 10$ each and some small frames for 7$ each at a closeout sale if she bought 14 frames for 110$ how many of each type did she buy
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