## How many addition signs should be put between digits of 987654321

How many addition signs should be put between digits of 987654321 to equal 99? Where should they be placed? Time to solve 10 minutes.

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*This year would surely bring new lights in your life. Happy new year to you all the time.*

Submitted by Atanu Chaudhuri on Thu, 14/01/2021 - 23:47

Submitted by Atanu Chaudhuri on Mon, 11/01/2021 - 23:54

Cherry in the glass puzzle: Move 3 matchsticks to take the cherry out of wine glass. Second puzzle is harder: Move 2 matchsticks to take the cherry out.

Submitted by Atanu Chaudhuri on Mon, 28/12/2020 - 18:04

Two daily life examples of application of Other way round inventive principle are highlighted. One of the two is analyzed in detail to arrive at the inventive solution just by Question, analysis, answer technique without applying any inventive principle directly.

Goal is to show how a common person can reach an inventive solution without being aware of inventive principle used and thus become conscious about the inventive possibilities...

Submitted by Atanu Chaudhuri on Tue, 22/12/2020 - 23:37

9 squares puzzle: Find area of rectangle with 9 gradually smaller squares inside it and the side length of smallest square 3 units. Time 30 minutes.

Submitted by Atanu Chaudhuri on Mon, 21/12/2020 - 22:33

Transform the negative forces around you in a difficult situation to positive resources and inventively achieve what all thought to be impossible otherwise. Adapt in your own way the concrete steps elaborated to do this...

Submitted by Atanu Chaudhuri on Thu, 17/12/2020 - 23:30

Surely you can solve the 3 digit number puzzle in 20 mins if you approach the puzzle with systematic problem solving techniques.

Submitted by Atanu Chaudhuri on Sat, 05/12/2020 - 01:45

What is in 2012th position of PROBLEMSOLVINGPROBLEMSOLVING... continued indefinitely? To solve the repetition pattern riddle, find a rule in repetitions.

Submitted by Atanu Chaudhuri on Fri, 04/12/2020 - 21:08

Open just one box and tell the colors of the balls in all three boxes. Solution is by systematic problem solving in steps...

Submitted by Atanu Chaudhuri on Wed, 18/11/2020 - 23:32

In liar and truth-teller riddle, to know the safe path, a traveler can ask only one question to any one of a habitual liar or a truth-teller. What to ask?

Submitted by Atanu Chaudhuri on Sun, 15/11/2020 - 17:52

Bridge Crossing Riddle: 4 persons to cross a bridge at night in 17 mins. Two persons can cross at a time with crossing speeds of each different. Read on...