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Its relatively simple:
one side has a length of 19 inches meaning that out of that 6 squares could be cut with a 3 inch side (6 X 3 = 18).
On another side the length is 23 inches meaning that 7 squares could be cut with a 3 inch side (7 X 3 = 21).
Then 6 squares can be cut on one side X 7 squares on the other side = 42
one side has a length of 19 inches meaning that out of that 6 squares could be cut with a 3 inch side (6 X 3 = 18).
On another side the length is 23 inches meaning that 7 squares could be cut with a 3 inch side (7 X 3 = 21).
Then 6 squares can be cut on one side X 7 squares on the other side = 42
The reason your answer is wrong is because your calculations uses the entire surface area. The questions asks how many perfect squares can you cut out. You can only cut out 42 perfect squares.
Your answer gives 48 because it assumes that all the excess foil scraps left over around the edges cannot be somehow combined to form more 3x3 squares. But you cannot do this.
Example
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The above strip of foil is 10 inches long. 3 inches thick.
If you try to cut out "3x3" sqaures, then you'll get 3 perfect squares, with some foil left over on the end.
Your answer gives 48 because it assumes that all the excess foil scraps left over around the edges cannot be somehow combined to form more 3x3 squares. But you cannot do this.
Example
____________________
____________________
The above strip of foil is 10 inches long. 3 inches thick.
If you try to cut out "3x3" sqaures, then you'll get 3 perfect squares, with some foil left over on the end.
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