Prove that the below maths equation is true.

8 + 8 = 91

How many letters are in the alphabet?

Which five letter word can be added at the end of below word to form a
valid word?

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I am the largest in my family of fifty.
The youngest of our family lives separately from the rest of the family and so do I.
I am regarded as harsh and tough.
I am so large, you cut me in two equal halves,
each half would still be larger than the second largest member of the family.
Who am I?

When my father was 31 I was 8. Now he is twice as old as me. How old am I?

Through your logical capabilities, can you make 7 an even?

It has a long neck, A name of a bird, Feeds on cargo of ships, It's not alive,

What is it?

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?

Chhote se Chintu Miyan,
Lambi si Pooch.
Jahan Jaye Chintu Miyan,
Wahan Jaye Pooch.

छोटे से चींटू मियाँ,
लंबी सी पूंछ।
जहाँ जाये चींटू मियाँ,
वहाँ जाये पूंछ।

Bolo kya?

I have branches, but no fruit, trunk or leaves. What am I?