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?
B. 7 and a half
D. 12 and a half
Notice that for 1/3 of a room, she used 2.5 cans.
For 2 full rooms (i.e. 6 times the initial work), she will need a total of 2.5 * 6 = 15 cans
So she needs 15 - 2.5 = 12.5 more cans to finish her room and paint another room of the same size.
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