5. Find the greatest 4-digit number which is exactly divisible by 8, 12 and
20.
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The LCM of 8, 12, 20 is 2³×3×5 = 120. So the numbers exactly divisible by 8, 12 and 20 are precisely the multiples of 120. The problem can now be reworded as: Find the greatest 4-digit number that is a multiple of 120. 120 × 83 = 9960
correct or wrong
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