Problem of the day!!! #4

United States
November 29, 2006 3:53pm CST
In a stationary store, pencils have one price and pens have another price. Two pencils and three pens cost 78¢. But three pencils and two pens cost 72¢. How much does one pencil cost? First to answer correctly gets the best response.
2 responses
@mythmoh (3986)
• United States
1 Dec 06
2pe+3p=78 3pe+2p=72 multiply first by 2 4pe+6p=156 multiply second by 3 9pe+6p=216 sub 1 from 2 5pe=60 pe=12 so one pencil is 12 cents sub in 2 48+6p=156 6p=108 p=18-- pen costs 18 cents
• United States
29 Nov 06
The answer is 12 cents. :)