N comes from National.
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The n is an unknown variable.
There are n! (n factorial) ways that n people can stand in line. So six people can stand in line in: 1*2*3*4*5*6 = 720 different ways
n * 4 = 80 Divide both sides by 4: n = 20
N x N + 1 = answer
Let M stand for Martha's age. Let N stand for Ned's age.M = 2*NM+N=242*N+N=243*N=24N=8M=2*8 = 16Ned is 8 and Martha is 16.