The following is a puzzle from *Rational Amusements from Winter Evenings *(1821) by John Jackson:

If from six ye take nine, and from nine ye take ten

(Ye youths, now the mystery explain;)

And if fifty from forty be taken, there then,

Shall just half a dozen remain.

Can you figure out what’s going on? This is not an easy one so you may take your time.

## Solution

Have you figured it out? Simple arithmetic alone won’t solve this. You must apply your knowledge of math, Roman numerals, and wordplay to crack this puzzle.

Here’s the solution:

SIX – IX = S

IX – X = I

XL – L = X

There are more puzzles similar to this in the abovementioned book. If you like this kind of puzzle, then let me know and I’ll post a few more of them.

Pingback: A Not-So-Straightforward Math Puzzle — Learn Fun Facts – Wacks Formula – Math Shortcuts

Pingback: Another Not-So-Straightforward Math Puzzle | Learn Fun Facts

holy shit… I am bad at math, so it’s said at least, but I figured it out in one go??? I got into some severe trouble with my math teacher earlier, when I figured out the most difficult question on the sheet in a test, but left all other easy questions unanswered, due to no time, but she would not believe it. She rather thought I was about to anger her… Well, I still would think I am the most stupid pupil of all and of all time. I just had some other info, did I ? Who knows.. . I don’t even know myself. ☻♦

I always read words in other/different meanings and take it quite far, so there is always a solution at hand…

LikeLiked by 1 person

Good for you. Specialized mathematical fields like number theory and topology badly need people with that kind of mindset.

LikeLike

Your sarcasm is always so sweet…. 😉

LikeLiked by 1 person

No, I’m serious.

LikeLike

Yes, but there is another solution. From 6 take 9, you’re left with -3. From 9 take 10, you’re left with -1. So we have -4. From 50 take 40, leaves 10 … 10-4=6 and 6 is half a dozen.

LikeLiked by 1 person

It would have worked if that’s the case (-3 + -1 + 10 = 6). However, the puzzle states: “And if fifty from forty be taken”. So, it’s 40 – 50 which is equal to -10.

LikeLike

Clever!

LikeLiked by 1 person

This was awesome 👍

LikeLiked by 1 person

My partner liked the challenge, & enjoyed playing round with roman numerals. He would be happy for you to post more!

LikeLiked by 1 person

I’ll post it on Saturday then 🙂

LikeLiked by 1 person

It is so good to know that somebody remembers Roman numerals.

LikeLiked by 1 person

It seems that many people nowadays only know up to X or less.

LikeLike

Nice brain teaser to try to solve over morning coffee. Thank you!

LikeLiked by 2 people

You’re welcome

LikeLike

Nice puzzle. I tried working with Roman numerals, but didn’t get the trick of using them in conjunction with actual words. That was very sneaky!

LikeLiked by 1 person

That’s the hard part.

LikeLiked by 1 person

I enjoy puzzle like this. Thanks for sharing.

LikeLiked by 1 person

Glad you liked it

LikeLiked by 1 person

Lovely puzzle!! Enjoy and learnt both

LikeLiked by 1 person

🙂

LikeLiked by 1 person

Holy Schnikes 🤪

LikeLiked by 1 person

wow 😀

LikeLiked by 1 person