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
George saves nickles and dimes for tolls. If he has 28 coins worth $2.60, how many are nickles and how many are dimes? Please solve:

(3x^2+5x).(X-1)