Find the next number in the series below

21 32 54 87 131 ?

Can you solve the below geography rebus by decoding the below rebus ?

You are given with the following sum. Each of the letters can be decoded as a digit. If we tell you that D = 5, then can you solve it entirely?

DONALD
+GERALD
=ROBERT

Christina is practising her dance steps along with her friends. In a particular sequence, all of them form a row. At that point, Niharika is standing in the 4th position from either end of the row.
Can you find out how many girls are practising together?

Prove that the below maths equation is true.

8 + 8 = 91

What does the following represent?

N N N N N N N

A A A A A A A

C C C C C C C

I have cities, but no houses. I have mountains, but no trees. I have water, but no fish. What am I?

A bag contains 64 balls of eight different colours. There are eight of each colour (including red). What is the least number you would have to pick, without looking, to be sure of selecting 3 red balls?

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

Sachin bought a car with a strange 5 digit numbered plate.The water image of the number is 78633 more than my car number. All the digits of car number are distinct.

What is the original number on number plate?