How can you make the following equation true by drawing only one straight line: 5+5+5=550 ?

Can you solve this amazing hard number series problem?
7, 8, 10, 12, 16, 18 ?

What is at the end of a rainbow?

What three numbers, none of which is zero, give the same result whether they’re added or multiplied?

Make eight squares by moving only two matchsticks.
Note- Square can be of different sizes.

Rose, Lily and Jasmine decided to buy flowers for their moms on Mother's Day. One of them bought lilies, the other roses, and the third one jasmines.
'It's funny!' said the girl with roses, 'we bought roses, jasmines and lilies, but none of us bought the flowers matching her name'.
'You're right!', said Lily.
What kind of flowers did each of the girls buy?

If we change the South-East direction into North and North-East into West and all others similarly.
Can you find out which direction will be in the place of South-West direction?

I am the one who remains awake when you sleep. But I need to rest when you awake. Who Am I?

I know a ten-letter word in the English language which can be typed using only the top rows of the computer keyboard.

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?