a rectangle hall is 16m long and 12m wide . How many marble slabs of size 25×15cm are needed to cover the hall.
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area of rectangular hall = 16m × 12m = 1600cm × 1200 cm
Area of a marble slab = 25 cm × 15 cm
number of marbles required to cover the hall= (1600 cm × 1200 cm) ÷ (25 cm × 15cm) = 5120 marbles
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