The square root of number 121 is "11". What is the square root of the number "12345678987654321."?

Replace the question mark with the correct number below.

In a university, a professor gave a set of three problems to the three brilliant students of his class. See the image for the questions.

You have four chains. Each chain has three links in it. Although it is difficult to cut the links, you wish to make a single loop with all 12 links. What is the fewest number of cuts you must make to accomplish this task?

There is a hypothetical state between the USA and Mexico border 'Tango'.
Here 70 percent of the population have defective eyesight, 75 percent are hard of hearing, 80 percent have Nose trouble and 85 percent suffer from allergies, what percentage (at a minimum) suffer from all four ailments?

Alex opened 24 presents
Jonah opened 8 presents
Clara opened 1 present

Can you find out how many presents were opened by Candy?

Find the mistake in the below maths equations

A = 2
A(A-1) = 2(A-1)
A2-A = 2A-2
A2-2A = A-2
A(A-2) = A-2
A = 1

The person who makes it has no need for it. He who purchases it does not use it. The person who does use it does not know they are. What is it?

Do You See It?

What word does this rebus represent?

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