Find The Next Number In The Sequence

30 10 15 13 0 16 -15 ?

Our product and our sum always give the same answer. Who are we?

There is a square of a particular number which when doubled, becomes 7 more than its quarter.

Can you find the number?

This is a most unusual paragraph. How quickly can you find out what is so unusual about it? It looks so ordinary, you'd think nothing was wrong with it. Actually, nothing IS wrong with it. But it is not as ordinary as you might think. If you think about it for a bit, you will find out why it is truly so unusual. So what is it? What is so unordinary about this paragraph?

All Marigolds are flowers.
Few Flowers are used to make colors.
Therefore, some Marigold are used to make colors.

True Or False?

One is to three as three is to five and five is to four and four is the magic number.
What is the pattern?

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

What does this mathematical rebus means ?

Can you count the number of triangles in the picture below?

In a rainy season, one day 3 huge ladies walked under a normal-sized umbrella.
The umbrella is not huge enough to accommodate all 3 ladies yet not a single lady got wet. Why?