Interview Question

Project Analyst Interview

How many ridges around a quarter?


Interview Answer

17 Answers


Make some assumptions:
1. the circumference of a quarter is ___ inches.
2. the average ridge is 0.__ inches wide.
3. do the math.

Gil on 2010-12-30

4. If you go around the face of the quarter, you'll pass 4 ridges.

Tom M on 2010-12-30

Count the troughs. There will be an equal number of ridges.

Ed C on 2010-12-31

Enough to go all the way around!

nb on 2011-01-04

None of the ridges on a quarter go around it. All of the ridges on a quarter are orthogonal to the plane of the faces.

Jon A on 2011-01-04

119 on a quarter and 118 on a dime

i looked it up :)

Steve on 2011-01-11

Jon A. was on the right track. There are only 2 ridges which "go around" a quarter...the top ridge (heads side) and bottom ridge (tails)!

Dan B. on 2011-01-11

2 - one around the top and one around the bottom.

Mark on 2011-01-11

Work for someone else

hmm on 2011-01-11

I don't know...let's count them.

John on 2011-01-11

Just dip in ink and make it roll on a piece of paper, then count!

Phil on 2011-01-12

Who cares.

Diane on 2011-01-12

So what is the correct answer? I am persuaded by Dan B. and Jon A. that the answer to this question is "2" --

AND SHOULD ONE ASSUME, such a trick, or a tricky, question during a job interview, that the answer ought to be calculable right then and there? If so, common sense dictates that the answer in this case does NOT involve counting individual ridges positioned orthagonally to the face of the coin....

p.s. I have not searched elsewhere for an answer but rather am restricting my wondering to this site.

placebo on 2011-01-16

oops - this sentence should have started -

"AND SHOULD ONE ASSUME, for such a trick, or tricky, question..."

placebo on 2011-01-16

looks like Steve got the job cuz he looked it up!

trent on 2011-06-17

Phil had a very clever answer that interviewers would love.

Jason on 2011-11-22

Twice as many there are along 1/2 the coin's circumference.

Alan on 2013-01-28

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