find thenumber of marbles slabes each of dimension 40 cm * 20 cm to be laid around a square park of side 18 m to a width of 2m
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area of path=(18+2×2)^2-(18)^2
=484-324=160sq m
area of a slab=40/100 ×20/100=2/25 sq m
so
no. of slabs=160÷2/25=2000Ans
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