### Brain Teasers

# It is May 2003

It is May 2003 and today three planets and a central star are in a straight line (this isn't necessarily our solar system). The farthest planet takes 18 years to complete an orbit around the central star, the second farthest takes 9 years to orbit around the star, and the nearest takes 4 years 6 months. What month and year will it be when the planets and star are once again in a straight line? Assume they have the same axis of orbit and their calendar measurement is the same as ours.

### Answer

May 2012. Given the assumption that they have the same axis of orbit, in 9 years they will be aligned in a straight line ... even though they are not all on the same side of the star. The furthest planet with the 18 year orbit is on the far side of the central star, but still in line with the others.Hide Answer Show Answer

## What Next?

View a Similar Brain Teaser...

If you become a registered user you can vote on this brain teaser, keep track of which ones you have seen, and even make your own.

### Solve a Puzzle

## Comments

Good puzzle. I don't see a trick here. Isn't this just a Math teaser?

Yeah, why IS this a trick?

I wasn't sure if it was more math or trick, I am not good at categorizing yet, sorry :-(

LOL i think the trick is that this exact question (word for word) was in our school agenda (the thing we use to write down our homework in), in the margin,

Good trick. I said 18 years, thinking they all had to completely orbit. And that's why I teach reading!

didn't quite get that one.........

I think it was more mathematical than a trick.

I think it was more mathematical than a trick.

good teaser, but definitely more math than trick.

this is a nice question, but do consider putting it in math instead of trick.

Nice one!

I think the trick-section is the right place.

I think the trick-section is the right place.

i thought this one was more math to, but i got it right anyways

I think it's science

To post a comment, please create an account and sign in.

## Follow Braingle!