book Maths Puzzle Numerical Ability

how do you find the answer to this problem: What is the least positive integer that is divisible by whole numbers from 1 to 9.

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book Other Question

I NEED HELP SOLVING THIS:
(4X + 3W^2)(4X - 3X^2) How long will it take a bus traveling at 60 miles per hour to overtake a car traveling at 40 miles per hour if the car had a 1.5-hour head start?