my sensor gives a reading in resistance change. However, I can track that change easily with an amplifier circuit. However, I don't want to use in that way. I want to use my device by multiplying its resistance change as the next circuit is dependent on it. 'So suppose the sensor changes the resi...

Find what comes next in the following sequence. 01,04,09,16,25,36,49,64,81,00,21,44,69,96,25,? Bonus: What is the rule of the sequence?

You have 100 coins laying flat on a table, each with a head side and a tail side. 10 of them are heads up, 90 are tails up. You can't feel, see or in any other way find out which side is up. You cannot flip any of the coins. Split the coins into two piles such that there are the same number of he...

I posted a question back in 2016. As an open-ended challenge it was on topic at the time, and now it's not, which is fine. Now the question has been closed, which is also no problem for me. The question is, was closing it now really necessary? The question had no activity for years and I've barel...

You have a given a scale which has 4kg and 2kg on the left side and an 8kg stone on the right side of the scale. You have an additional 1kg. How you will balance the scale?

Here is a stunning new version of the famous bear problem. IT IS NOT A DUPLICATE, OR LATERAL THINKING. MATHEMATICS REQUIRED. A photographer stepped out of their tent with a camera and walked: 1 km south, then 1 km east, then 1 km north & finally 1 km west. Then the photographer was back exactly...

Lang's teacher gave a piece of paper to Lang and said to him, "Three good quotes are written here. But you have to achieve them through some difficulties". The following was written in the paper: (a) CAJEQO EO KJA LANYAJP EJOLENWPEKJ WJZ JEJAPU-JEJA LANYAJP LANOLENWPEKJ. (b) ZIQQHUV QHYHU TXLW D...

"This is really straightforward if you are from the other side of the pond", said Grandpa. "Put your lateral thinking hat on and prove this to me: Yes x No = VIIX Being from US, this was not strightforward for me. How about you?

This is a visual puzzle (known as "mosaic" or "fill-a-pix") with the same rules as MineSweeper: This puzzle has exactly 100 x 100 cells. The grid is to be filled with colored and white tessera. Choose whatever color you like for the colored ones. The number in each cell indicates how many colore...

Alice and Bob play the following game, taking turns. Alice starts and writes a non-zero single digit number at the blackboard. At every turn, each player adds a single digit at the right of the current number until a number with 9 digits is reached. If this number is divisible by 11, Alice wins o...

My rhymes got blacked out and mixed up! Can you get them intact and fixed up? Live on stage, that idol's new. ███████████████████████ay. Too low, maybe sing a little higher. ███████████████████████ge. Gore and guts are common in the Mob. ███████████████████████ir. Heaven in a cup, t...