reasoning Maths Puzzle

100 birds were sitting on a tree.
A shooter shoots one of the bird and bird died instantly.
How many left now ?

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reasoning Other Question

I know a 5 digit number having a property that With a 1 after it, it is three times as large as it would be with a one before it. You have two hour glasses one measure 7 minutes and other measure 4 minutes.
Using these two hour glasses, you need to measure exactly 9 minutes.