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

Rumel, A detective who was mere days from cracking an international smuggling ring has suddenly gone missing. While inspecting his last-known location, you find a note:

710 57735 34 5508 51 7718

Currently, there are 3 suspects: Bill, John, and Todd. Can you break the detective's code and find the criminal's name?

In the four images below, can you find the odd one out?

Can you find the ages of a son, father and grandfather based on the following facts?
The sum of the ages of grandfather, father and son is 140 years.
The age of the son in months is the same as the grandfather in years.
The age of the son in days is the same as the father in weeks.

Can you convert the number zero(0) into a positive number using just one mathematical operator ?

I am weightless, but you can see me. Put me in a bucket, and I'll make it lighter. What am I?

What is full of holes but still holds water?

Which tank will fill first?

A Doctor always sneezes before the rain. Doctor sneezes, Will it rain?

What seven-letter word has hundreds of letters in it?