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

How Come ??

Sally lives in a place where six months of the year is mild summer and the temperature drops significantly the other six months. She owns a lake where there is a small island. She wants to build a house on the island and needs to get materials there. She doesn’t have a boat, plane, or anything to transport them to the island. How does Sally solve this problem?

I organized a small get together at my home.
In the party , i have a barrel with some whiskey in it.

Suddenly Guest 1 say 'I bet this barrel of whiskey is more than half full'.
'No, it's less than half full' Guest 2 replied.

I don't have any measuring instrument and without removing whiskey from it , how can i determine which of the guest is right ?

When monkey rotate the gear, which mark will be hit 1 or 2 ?

What makes this number unique: 8,549,176,320?

Can you find out the missing number in the grid?

Baseball bat and ball cost $100. If the bat cost $99 more than the ball, what is the cost of each?

I come in different shapes and sizes.
Parts of me are curved, other parts are straight.
You can put me anywhere you like,
but there is only one right place for me.
What am I?

Twenty frogs are sitting on a log floating on the surface of a river. Two of them decide to jump off into the water.

How many frogs are there on the log at this moment?

Can you find the next number in the below sequence
3 , 7 , 10 , 11 , 12 , 17 ?