View Full Version : Verbal expression, consecutive even integers
blazin420
Oct 5, 2009, 02:47 AM
four times the lesser of two consecutive even integers is 12 less than twice the greater number. Find the integers.
ArcSine
Oct 5, 2009, 03:57 AM
Any even integer can be written in the form 2k, where k is an integer. For example, 32 is 2k, where k is 16; -18 is 2k where k is -9.
Let your "two consecutive even integers" be 2k and 2k + 2. Then your word problem sets up as
4(2k) + 12 = 2(2k + 2)
Solve for k, and then you can easily determine your two integers. Be sure to test your proposed answer back into the problem before you call it a day.
ebaines
Oct 5, 2009, 08:48 AM
I find it easier to think of the smaller number as N and the larger as N+2. Then the problem becomes
4* smaller = 2 * larger -12
4N = 2(N+2)-12
Solve for N.
ArcSine
Oct 5, 2009, 10:50 AM
Roger that... using N instead of 2k for the lesser of the two integers certainly gives an easier set-up, and simpler algebra. I just used 2k so that the original model would be respecting the problem's stated "even" integer requirement right from the get-go. Overkill in this case, sure; just a habit of being overly cautious when I'm getting one teed up, before I take a swing at it.
Adios, gentlemen, and have a nice one...