Nina glues pictures on a rectangular piece of cardboard. The piece of cardboard is 20 inches long and 9 inches wide. Each rectangular picture is 7 inches long and 4 inches wide. She glues 3 pictures on the cardboard. The pictures do not overlap. What is the area of the cardboard that is not covered by pictures?
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length of the cardboard = 20 inches
width of the cardboard = 9 inches
area of the cardboard = lb
=20×9
=180 sq.inches
length of the picture = 7 inches
width of the picture = 4 inches
area of the picture in rectangular shape = lb
area of three pictures = 3lb
=3×7×4
=84 sq.inches
area of remaining part = 180-84
=96 sq.inches
width of the cardboard = 9 inches
area of the cardboard = lb
=20×9
=180 sq.inches
length of the picture = 7 inches
width of the picture = 4 inches
area of the picture in rectangular shape = lb
area of three pictures = 3lb
=3×7×4
=84 sq.inches
area of remaining part = 180-84
=96 sq.inches
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