# How long will it take me to finish the necklace

+1 vote
288 views

Below you can see several bits of broken chain. I have been told to join up all the pieces to make a complete necklace using all twenty links.
However, it is a very fiddly job, and it takes one minute to cut one link, and two minutes to join it up again. How long will it take me to finish the necklace?

posted Apr 13, 2014

Lets give the number to the chains
1 2 3 4
5 6 7 8

Make a cut in 1 and fix it between 3 & 4 (one cut is suffice)
Make a cut in 2 and fix it between 7 & 8
Cut both the rings from 5 fix one of them between 4 & 8 and another between 6 & &7
Cut one open end of the 6 and fix it with 3.

Total Cuts = 5 i.e. 5 Min
Total Joints = 5 i.e. 10 Min
Total = 15 Min

Similar Puzzles

You begin reading a book 240 pages long. If you read half of the remaining book each day, how long would it take you to finish the book?

+1 vote

There is a water-cask with three different water-taps. With the smallest tap, the water-cask can be filled in 20 minutes. With the middle tap, the water-cask can be filled in 12 minutes. With the largest tap, the water-cask can be filled in 5 minutes.

I want to fill my bucket using both cold and hot water.
I have two taps for both cold and hot water. The hot water tap fills the bucket in exact 6 hours and cold water tap fills the bucket in exact 4 hours.
I turn both of them simultaneously but I forgot to turn off another tap which removes the water out of the bucket. This tap can empty the bucket in 12 hours.

How long will it take to fill the bucket?