How can you make number one disappear by adding something to it?

Which tank will fill first?

A maths symbol is hidden in the below Bar Graph. Can you decipher it?

Find The Next Number In The Sequence

30 10 15 13 0 16 -15 ?

A four-digit number (not beginning with 0) can be represented by ABCD. There is one number such that ABCD=A^B*C^D, where A^B means A raised to the B power. Can you find it?

It was a dark stormy night and a couple were in a car driving madly to a city. The car broke down and the husband had to go get help from someone who spoke his language. He was afraid to leave his wife alone in the car so he locked the car before leaving. When he came back, the car was in the same state as he had left it but his wife was dead, there was blood on the floor and there was a stranger in the car. What happened?

My thunder comes before the lightning; my lightning comes before clouds; my rain dries all the land it touches. What am I?

How is the moon similar to a dollar?

Count the number of triangles in the picture below:

Find the missing number in the image below.