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Math problem: How many square centimeters of wrapping paper does it take to wrap two schoolbags with a length of 25cm, a width of 15cm and a thickness of 4cm?
Make two schoolbags with a length of 25cm, a width of 15cm and a thickness of 4cm into one bag.

When wrapping paper is used at least, two schoolbags should be folded together.

If the foundation height is 25x 15, it becomes 4x2=8cm.

The volume is 25x 15x8=3000 cubic centimeters.

The surface area is (25x15+15x8+25x8) x2.

=(375+ 120+200)x2

=695x2

= 1390 cm2