Find The Next Number in the series:

12 13 15 17 111 113 117 119 123 ?

Take 9 from 6, 10 from 9, 50 from 40, and leave 6.

How Come ??

If one and a half boys, eat one and a half burgers in one and a half hours.

How many burgers can 9 boys eat in 3 hours?

A famous swimmer can swim downstream in a lake in exactly 40 minutes with the lake current.
He can swim upstream in that lake in exactly 60 minutes against the lake current.
The length of the lake is 2 km.

How long he can cover the distance of one side at a still lake with no current?

What part of the chicken has the most feathers?

The centre of the third figure is empty. What digit should fit inside?

I don't get anymore wetter, no matter how much rain falls on me.

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

10+10 and 11+11 can give you the same answer.

Explain how?

If you’ve got me, you want to share me; if you share me, you haven’t kept me. What am I?