Which tank will fill first?

In front of you, there are 9 coins. They all look absolutely identical, but one of the coins is fake. However, you know that the fake coin is lighter than the rest, and in front of you is a balance scale. What is the least number of weightings you can use to find the counterfeit coin?

Count the Triangle in the figure given below:

Can you find a pattern and the missing number in the series given below?

100, 155, 258,? , 584, 819.

Can you find the missing piece of the Porsche?

What does below pictogram mean?

Below is the sum of symbols in each row and column in the figure. Analyzing the figure, can you find out the value of the symbols?

Find the next number in the series below

21 32 54 87 131 ?

You’re out on the water and see a boat filled with people. You look away for a second and look back again, but this time you don’t see a single person on the boat. Why? Hint: The boat did not sink.

What is the four-digit number in which the first digit is one-third the second, the third is the sum of the first two, and the last is three times the second?