exam Maths Puzzle Numerical Ability

I need to find the GCF for the group in the problem below, and the steps to reach the solution. Can anyone help?

6a�b, 9ab�, 15a�b�

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exam Other Question

a commercial jet travels 2400 miles in the same amount of time it takes a corporate jet to travel 1600 miles. the rate of the commercial jet is 200 mph faster than the rate of the corporate jet. find the rate of each jet. Reciprocal for (-1/5)(20/5))10)