Three consecutive positive integers k, l and m are such t...
Three consecutive positive integers k, l and m are such that l2 = 3(k+m). Find the value of m.
4
5
6
7
Correct answer is D
l2 = 3 (k + m)
Since they are consecutive positive numbers, we have
l = k+1, m = k+2.
→ (k+1)2 = 3(k + k + 2)
k2 + 2k + 1 = 3(2k + 2)
k2 + 2k + 1 = 6k + 6
k2 + 2k - 6k + 1 - 6 = 0
k2 - 4k - 5 = 0
k2 - 5k + k - 5 = 0
k(k - 5) + 1(k - 5) = 0
k = -1 or 5
Since k, l and m are positive, then k = 5.
m = k + 2 = 5 + 2
= 7.
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