Puzzle

[sinjun]

Supply the missing number.


A B_ C_ D 16
A B_ C_ A 10
A B_ D_ B 14
B C_ C_ D 20
6 14 22 ?


Comments

[wibbble]

A to D are 1, 3, 5, and 7 - the first four odd numbers.

I started off deciding that A must be 1 and B must be 3, because that was the only integer solution to A + A + A + B = 6. Then I worked from there.

And then I added up the last column wrong. ;o)

[insaint.livejournal.com]

*grins* I started with horizonal rows and established that D = A + 6, C = B + 2. Then I got D = C + 2 by substituting letters in one of the columns.

Then from D = A + 6 = C + 2 = B + 4, I worked out the answer. :)

[wibbble]

I think you did it the quicker way, but my way didn't cause me to get a headache. ;o)

[insaint.livejournal.com]

*snickers* Math is fun!

(Except finance.)

[damara.livejournal.com]

Bah humbug!

[insaint.livejournal.com]

*snugs*