Using Only Five 5's and any mathematical operator make sum as 37

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

Rectify the following equality 101 - 102 = 1 by moving just one digit.

A Scientist was fifty years old in the year 2000 but he was forty years old in the year 2010. How can this be possible?

PS: It has a logical answer.

With the help clues provided in the image, can you find the 5 digit key?

A mathematics teacher took exams for his students. Out of the total students, 25% passed both the tests included in the exam. However, only 42% were able to clear the first test.

Can you find out the percentage of those students who passed the first test and also passed the second test?

If Rajina's daughter is my daughter's mom, who am I to Rajina?

You have two bottles of pills marked with labels A and B. The pills are identical. The doctor has asked you to take one A pill and one B pill daily. You cant take more or less than that.

While taking out the pills one day, you took out one pill from A and by mistake took out two from B. You have no idea which pill is which now.

You cant throw away the expensive pills. What will you do now?

You may enter, but you may not come in. I have space, but no room. I have keys, but open no lock. What am I?

How can you spell "White of an egg" in one word?
Hint: I know you can spell coke, poke, and joke.