Please do **NOT** post your answer, but do say if you think you have solved the puzzle and how long it took. Solution on Monday.

A carpenter is paid 2 pounds for each day that he works and forfeits 3 pounds for each day that he doesn’t work. After 30 days he has paid out exactly as much as he has received. How many days did he work?

I have produced an ebook containing 101 of the previous Friday Puzzles! It is called **PUZZLED** and is available for the **Kindle **(UK here and USA here) and on the **iBookstore** (UK here in the USA here). You can try 101 of the puzzles for free here.

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30 seconds……. again an easy one 🙂

Wow, I’m impressed!

Easy, no maths required. Divide the 30 days in the ratio 2:3 = 12:18

Dave’s Neighbor – that called maths

It’s also called posting the answer like it says not to!

About 15 seconds.

Wow, I’m impressed!

Took me as many seconds as number of days the carpenter had to work 🙂

Wow, I’m impressed!

1 min. I like a bit of maths on a Friday morning.

Wow, I’m impressed!

Zing!

Two easy.

three easy

Four easy

10 seconds of mental attempt before deciding to go for 20 seconds on paper. Then another 30 seconds deciding whether or not some might think this post is a spoiler. Which it isn’t. Or is it?

It could be, but then maybe not.

About two minutes. Good puzzle for my level of Maths.

easy, the obvious answer is… hey! mr carpenter what are you doing with this hammer? No! No!…

Took me about 15 seconds using trial and error.

pen and paper, 30 seconds

Two pounds per day? Call the Union now. The Carpenter needs someone to fight for his right to be paid at least the National Minimum Wage!

PS. It took about a minute. I could have done it quicker but my brain was still in “Union Leader on Holiday” mode.

No, it’s ok. He’s on the new Tory apprenticeship schemes. They couldn’t get him into Poundland.

He would be better off with one of those new fangled zero hours contracts. I imagine he’s liberating the boss’s power tools, one piece at a time and it didn’t cost him a dime.

I was more concerned by the seven-day weeks.

About a minute.

Oh, that was an easy one… 5 seconds – but then I probably worked it out a different way from others. Will be good to see everyone’s working on Monday

Couple of minutes. Too idle to get up & fetch paper so used Educreations

Does that include VAT? They always sting you with that at the last moment.

No, carpenters always demand to be paid in cash with no VAT receipt (or any guarantee for the work).

About half a minute or so using trial and error (although if I’d been thinking hard enough, I’m sure I could have used simultaneous equations).

Even if this puzzle dates back several decades (when £2/day was equivalent to about £200/day), being fined time and a half for non-working suggests he’s being exploited. Being a carpenter, you’d expect him to have a decent grasp of mathematics, so perhaps there’s more to his contract than meets the eye? 🙂

Less than a minute, but then I am at the bottom of a bottle of red! (& the carpenter really needs to contact the union!)

Took the mathematical approach. I think it took me about two minutes to solve it.

less than one minute. ciao

About 2 seconds to work out the answer, then c.15 seconds to write down the equation to check that I had done it correctly. But I didn’t see the gorilla.

The gorilla’s packed it in and joined the union. You can’t fool an animal that way.

About two thirds of a minute.

I think this depends on weather he works and/or is fined on weekends. Plus weather what day of the week the first monday of the month is, Without that knowledge, we cannot solve

it may also depend on the whether on the days he doesn’t work.

Thank you CTJ. That too.

It is not enough that we make all the ass-u-me assumptions of what is in Richard’s mind when he wrote the Puzzle. We must root it in the real world for the benefit of those who solve it next.

Or you could just read the fracking question and answer it Barry – or is that just too hard for you?

Less than a minute, with a bit of trial and error.

less than 5 minutes

About a minute using the magic of algebra.

-Matt

About 6 hours and 34 minutes

Too easy. So easy you can do the algebra in your head.

I like Friday Puzzles… you keep practising simple simutaneous equations, and then you get the answer immediately thanks to Dave…

Beware, Richard is watching us like lab rats. If not, he would easily be able to ban spoilers.

2x-3y=0, x+y=30, or y=30-x, so 2x-90-3x=0 5x=90 x=18, y=12 also, graphically, the 2 lines specified by the first 2 equations intersect at (18,12)

Nice!!!

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T*ss*r

thank you to make work the brains of our children

nitwit – I comprises 2x-3y = 0, x + y = 30 or y = 30-x,

but after how is you find so 2x-90-3x=0