A Doctor always sneezes before the rain. Doctor sneezes, Will it rain?

This isn't your average math problem. It requires you to see beyond basic operations and identify the hidden logic that connects the numbers.

18, 46, 94, ?, 52, 61

This is the oldest riddle that I have heard.

Once there was a man who was travelling with a Tiger, goat and grass.
He needs to cross a river that can carry a maximum of two i.e. Man + one of Tiger goat or grass. But the problem is "If he takes the lion with him, the goat will eat grass and if he takes grass with him, the lion will eat the goat".

How can he ensure the safe delivery of all three?

Can you arrange four 9's and use at most 2 math symbols, to make the total 100?

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?

Using four sevens (7) and a one (1) create the number 100. Except for the five numerals, you can use the usual mathematical operations (+, -, x, :), root and brackets ()

Three doctors said that Bill was their brother. Bill says he has no brothers. How many brothers does Bill actually have?

How many cubic feet of dirt are in a hole of one foot deep, three feet long, and two feet wide?

what does this below rebus represent identXQQQQQME

What can you serve, but never eat?