19 November 2024

Puzzle from real life – the coffee cleaning

Every couple of months or so, I face this dilemma. If you make your own cappuccino at home, you are familiar with the wand that heats and foams the milk. Now that wand has a head in the end which looks like the picture on your left. This has 4 small holes in the end – see middle picture. This is where the steam comes out from. Now, because it gets exposed to milk, from time to time it needs to be cleaned.

The cleaning instrument is a simple, small sharp needle – see picture on the right. All you have to do is put the needle in each of the four holes, give it a good spin and then at the end, soak it in water.

Now comes the problem. Once I have given one hole a good clean, I go to the next one. Once I am done with that, I get confused which one to go to next. Which one did I already do? Remember, there are no ways to identify a hole and I certainly do not want to put any scratches on the surface. If I do adjacent ones, for all you know, I have been doing the same two all the time. Because you are spinning the head, you are not sure your final orientation is the same the original one.

What might be a couple of tricks to make sure that with only four cleans, I get each one of them only once?

See answer here

12 November 2024

Now for a quiz on the lakes of the world

Growing up in India, as young students, we had learnt that the two largest lakes in the world were the Caspian Sea and the Black Sea. While trying to study up the lakes of the world this week, I realized that Black Sea is not considered a lake. It is an inland ocean. I wonder what is being taught in India these days.

Also, when looking up the lakes by size, I could not find one particular lake that we had learnt about in India – the Aral Sea. I have now learnt that the whole lake does not exist any more! It used to be the fourth largest lake in the world. Man made irrigation projects have diverted all the river sources and now it is a desert!

See if you know or can guess the answers to the following:

1. What is the country with most lakes? (it has more lakes than the rest of the world combined)
2. What is the highest navigable lake?
3. What is the lowest lying lake?
4. What is the largest lake in the Antarctica? (it is the 16th largest in the world)
5. What is the largest lake with salt water on one side and fresh water on the other?
6. What is the lake which has more species of fish than any other lake?
7. What is the largest lake in Europe?
8. What is the largest lake that is entirely within one country?
9. What is the longest freshwater lake?
and lastly, a weird one…
10. What is the largest alkaline lake? (it is also the largest desert lake in the world)

You can check here for your answers.

10 November 2024

Sunday morning quiz: Rivers of the world

After memorizing the names of countries, their capitals and currencies (got stuck with the flags with one third done), tying to now learn about the Top 50 Rivers in the world (by length). Learnt some fascinating facts. There are about 10-12 rivers in the Top 50 that I had never heard the name of!!

See how many of these you might get. The answers are posted here.

1. Which is the country that has most number of rivers in it? (The answer might surprise you)
2. Which country has the most number of Top 50 (by length) rivers running thru it? (It is a whopping 11 of them!)
3. Which river runs thru the most number of countries?
4. Which is the largest country with no rivers at all? (It used to have one long time back)
5. Which is the longest river entirely in one country? (Hint: Second longest such river is also in the same country)
6. Which is the river that has the most number of country capitals on its banks?
7. Which river has two country capitals bang opposite to each other on the two banks?
8. Which river (in the Top 50) has a country capital on it that is an anagram of the river name itself (but two different words)?
9. The longest river is the Nile. The widest is the Amazon. Which is the deepest river?

And finally a controversial one… since Guinness Book of World Records withdrew this category. So I am going by the recorded length of all rivers in the world.

10. What is the shortest river in the world? (It is barely 18 meters – yes meters. Apparently, if there is a constant flowing water, it is considered a river. I could find at least 7 rivers that are not even 100 meters long!!)

8 October 2024

Geometry quiz

Found this on the internet. Could not find the answer. If you work it out, let me know. Want to see if I got it right.

There is a square and a rectangle sharing a diagonal as you see in the picture. The shaded portion shared between them is 75% of the square’s area. Question is what percentage of the rectangle’s area is that shaded portion.

Screenshot
11 September 2024

A geometry puzzle on this tri-colored day

The three rectangles colored in US flag colors are identical. What is the angle ?

This Saturday, it took me nearly an hour and half to get it. So much so, I missed the farmers’ market trip with Sharmila and Jay Jay. Got this from the internet. The teacher who publishes this posts answers only on Twitter. Had to grab a friend from office who has a Twitter account to make sure my answer was correct.

Answer has been posted here.

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