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easy math questions 2

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easy math questions 2
a furniture company is building coffee tables from glass and wood.each table is 90 cm by 45cm.The width of the wood around the top is 7 cm.
a.) wHat length of wood is needed for the top of each table?
b.) If the edges of the grass are protected with a plastic strip,what length of this strip is needed for each table?
a) 90*2+(45-7*2)*2=246cm
b) 90*2+45*2=270cm