book Maths Puzzle Numerical Ability

find 3 consecutive even integers such that the sum of the first three is 24 more than the fourth

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book Other Question

4/(x-4)^2=1

i having alot of trouble with this one. I think i need to get the numerator over to the other side. Two gears rotate so that one completes one more revolution per minute than the other. If it takes the smaller gear one second less than the larger gear to complete one-fifth revolu