Est. 1998 — 27 years of woodworking knowledge
Friday Puzzler -- Missing Number
Alexy
In each line of the set of numbers below, the two numbers on a given line are used to generate the left number on the next line, using a well-defined rule. What number replaces the question mark? This is much harder than it might initially appear ;-)
72 99
27 45
18 39
21 36
? 28
13 21
7
Re: Friday Puzzler -- Missing Number
Larry Barrett
A number here, a number there, it all adds up.
Correct!
Alex Y
Sounds like you've got it. I'm impressed!
Did you initially think the answer was 3 larger than it is? I was not able to see the correct answer.
Re: Correct!
Larry Barrett
Yes, first try had an answer three larger than it turns out to be.