How many words can a pen with half refill write?

Can you decipher the two rows to find the hidden word?

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

Remove two matchsticks to make the below equation correct.

Three fair coins are tossed in the air and they land with heads up. Can you calculate the chances that when they are tossed again, two coins will again land with heads up?

I am a type of food that is often found in the fridge and can be white in colour. What I am?
Hint 1: I am a dairy product.
Hint 2: You can spread me on the bread.

The below given figure comprises of a pattern through which you can determine the missing letter. Can you push your mind to find the pattern and add the missing letter?

In which direction should the missing arrow point?

I am the black child of a white father, a wingless bird, flying even to the clouds of heaven. I give birth to tears of mourning in pupils that meet me, even though there is no cause for grief, and at once on my birth, I am dissolved into air. What am I?

Prove that the below maths equation is true.

8 + 8 = 91