Solve the alphametic puzzle by replacing the alphabet with the number.

S T O R M +
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A maths symbol is hidden in the below Bar Graph. Can you decipher it?

What demands an answer, but asks no questions

Its something that each of us devours,
Not just us but birds, beats, trees, and flowers,
Frets iron and nibbles steel,
Toil hard stones to meal,
Exterminates king, collapse town,
And blows the mountains down.

Place the numbers from 1 to 9 in the circles in a manner that each side of the triangle sums up to 17.

What is the largest number you can write with just 3 digits?

A 3 digit number is such that it's unit digit is equal to the product of the other two digits which are prime. Also, the difference between it's reverse and itself is 396.

What is the sum of the three digits?

Can you name an animal whose killing cannot be performed without spilling your own blood?

Two guards were guarding the camp.Guard-1 was looking towards the south to make sure no threat is coming from the road.Guard-2 was looking at the north to make sure no threat is coming from the top. Suddenly Guard-1 ask the Guard-2 why he is smiling?How Guard-1 knows that Guard-2 is smiling?

I have two sand hourglasses:
1. A 7 minute one and
2. An 11-minute one.

Using just these 2 sand hourglasses, how can I measure time as 15 minutes?