If two's company, and three's a crowd, then whats four and five ?

Can you solve this amazing hard number series problem?
7, 8, 10, 12, 16, 18 ?

We have four gears with below features=> Both Gear A and D has 60 teeth=> Gear B has 40 teeth=> Gear C has 20 teeth=> Every two minutes, Gear B makes 25 full turns.What is the relative speed of Gear A and Gear B?

What can run but never walk, have a mouth that never speaks, have a head that never weeps, and have a bed but never sleeps?

Identify the 10 differences between the two given pictures.

While preparing the table for dinner, wife came up with an idea to tease his mathematician husband. She asked her husband to pick nine toothpicks and make ten without breaking any toothpick.

The husband was also smart and did it within seconds. How ?

Two boys were admitted to a school. When the headmaster asks them about their parents, they tell him that they have same parents (father and mother). On further inquiry, it turns out that they both share the same date for their birthday.

"Are you twins," ask the headmaster.
"No," replies the boys.

Is it possible?

A man was just doing his job when his suit was torn. Why did he die three minutes later?

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

1 rabbit saw 9 elephants while going to the river. Every elephant saw 3 monkeys going toward the river. Each monkey had 1 parrot in each hand. How many animals are going towards the river?