length of a hall is 15cm and breadth is 13cm.if a carpet is to be laid leaving 4 cm on all sides. area of the hall left uncovered?
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area of the hall = 15 x 13 = 195 cm²
dimensions of the carpet
length = 15 - 2x4 = 7 cm
breadth = 13 - 2x4 = 5 cm
area of the carpet = 7 x 5 = 35 cm
area left uncovered = (195 - 35) cm²
= 160 cm²
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