Prove that the below maths equation is true.

8 + 8 = 91

I cannot talk, but I always reply when spoken to. What am I?

There are three boxes which are labeled as Rs100, Rs150, and Rs200. One box contains two notes of Rs. 50. The second box contains one note of Rs50 and one note of Rs100 The third box contains two Rs. 100 notes. All boxes are labeled incorrectly.

What is the minimum number of boxes you must check in order to label all boxes correctly?

A gardener planted the Lemon trees in a mathematical ordered way (i.e. he planted a tree in rows).
He created a total of 19 rows of trees.

Note: There should be more than 2 trees to count as a row.

What is the minimum number of trees required by the gardener to have 19 rows of trees?

I am looking for a word that change both gender and number when i add the letter 'S'.

What Word am I Looking For ?

There is a square of a particular number which when doubled, becomes 7 more than its quarter.

Can you find the number?

The horse jumps over the king.
Strangely there is absolutely no scratch on him.

Can anyone explain, how is this possible?

What Does this text mean:

important=important

Solve the following series:
AZ, GT, MN, __, YB

Which is the smallest number that you can write using all the vowels exactly once?