book Maths Puzzle Numerical Ability

Can someone help me with this problem?

What would be the least common multiple of 3, 6, and 9.

Thanks!
Sher

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book Other Question
the height of the eiffel tower is 974 ft, which is about 669 ft higher than the statue of liberty. what is the height of the statue of liberty?

i wrote (974ft-669ft=305ft)
E-S=H
is there a better way of writing this? thanks what is the discriminant in the quadratic equation x2 + 11x + 121 = x + 96