Diane find 2 and a half cans of paint are just enough to paint one third of her room. How many more cans of paint will she need to finish her room and paint a second room of the same size?
Choose the correct answer:
A) 5
B) 7 and a half
C) 10
D) 12 and a half
E) 15
We know that 2.5 cans = 25/10 is used to paint 1/3 of a room. We need to find how much paint we'll need in order to paint the rest of the room (1-1/3=2/3) and 1 room more, hence 2/3+1=5/3   25/10 : 1/3 = x : 5/3   (25/10)*(5/3) = (1/3)*x   25/6=x/3   6*x=25*3= 
<gadget id="calculator">25*3</gadget>
<output>75</output>
75/6= 
<gadget id="calculator">75/6</gadget>
<output>25/2 = around 12.5</output>
12.5   ANSWER:12 and a half
<result>D</result>
Diane find 2 and a half cans of paint are just enough to paint one third of her room. How many more cans of paint will she need to finish her room and paint a second room of the same size?