Carina has 55 ounces of coffee divided into 5- and 10-ounce packages. If she has 2 more 5-ounce packages than 10-ounce packages, how many 10-ounce packages does she have?	Pick:
A) 7
B) 6
C) 5
D) 4
E) 3
Lets say 5 and 10 ounce packages be x and y respectively.   Given that, 5x+10y=55 and x=y+2. What is the value of y.   Substituting the x in first equation, 5y+10+10y=55 -&gt;y=45/15.= 
<gadget id="calculator">45/15.</gadget>
<output>3</output>
3   3
<result>E</result>
Carina has 55 ounces of coffee divided into 5- and 10-ounce packages. If she has 2 more 5-ounce packages than 10-ounce packages, how many 10-ounce packages does she have?