a brick layer lays 210 bricks in 3 hr how long will it take for him to lay 840 bricks
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840 bricks is 4 times of 210 bricks
∴ It will take 4 × 3 hr = 12 hr for him to lay 840 bricks
∴ It will take 4 × 3 hr = 12 hr for him to lay 840 bricks
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