Replace the question mark with the number below given a simple math problem.

What does it mean?

In which direction should the missing arrow point?

What is the probability of choosing the correct answer at random from the options below?

a) 1/4
b) 1/2
c) 1
d) 1/4

What does this rebus riddle mean?

A new clothing store has a unique method of pricing items. A vest costs $20, a tie costs $15, a blouse costs $30, and underwear costs $45. How much would pants cost?

How is a fly different from a mosquito?

You are given four results as below:
1111 = F
2222 = E
3333 = T
Then, can you find out how to code 4444?

Christina has four daughters, and each of her daughters has a brother. How many children does Christina have?

Can you count the number of triangles in the picture below?