Can you find the odd number in the following?

2716, 4135, 5321 and 7145

If you drop me I’m sure to crack, but give me a smile and I’ll always smile back. What am I?

A bridge is about to collapse. There are four people P, Q, R and S on one of the sides. Before the bridge collapses, they want to cross it. Now since the bridge is too weak, it can only stand the weight of two people at a time. Also, it is night time and nothing is visible. They have just one torch with them.

Now P takes one minute to cross the bridge, Q takes two minutes to cross, R takes five minutes to cross and S takes ten minutes to cross.

The bridge will collapse in seventeen minutes. How will they be able to cross the bridge before it collapses?

It is a nine-letter word.
The exact opposite of the phrase "friendly and outgoing"
It contains the word "over".
It starts will a vowel.

What is it?

How can you take 2 from 5 and leave 4?

If 5 cats catch 5 mice in 5 minutes, how long will it take one cat to catch a mouse?

I am the fastest animal but cannot climb the tree. What am I?

I look at you, you look at me I raise my right, you raise your left. What am I?

'Ferrari driver' easily beats the 'force driver' in a two-car race. How did Indian newspapers truthfully report so to look as a 'force drive' had outdone the 'Ferrari driver'? Think!!!

Two girls were born to the same mother, on the same day, at the same time, in the same month and year and yet they're not twins. How can this be ?