A brand new Mobile Phone was on sale at 20% as a promotional offer. By what per cent must the Mobile price be increased to sell it at the original price again?

All of you like to eat me. I am a five-lettered word. Remove the first two and I turn into an infamous animal. Remove just the first and I become a heinous crime. Remove the first and the last and you can groove on me.

Can you guess who am I?

Solve the counting riddle by identifying the number of triangles in the given picture.

The square root of number 121 is "11". What is the square root of the number "12345678987654321."?

Your job is to measure 45 minutes if you have only two cords and matches to light the cords.

1. The two cords are twisted from various materials, so their different segments can burn at different rates.
2. Each cord burns from end to end in exactly one hour.

Describe your way of measuring the 45 minutes.

They do not possess flesh or feathers or scales or bone
But still, they are blessed with fingers and thumbs of their own.

Place a mathematical symbol between the numerals 5 and 9 in such a way that the resulting number is greater than 5 but smaller than 9.

Find the next number in the series?
2, 12, 36, 80, 150, 252, 392, _ ?

Why Aeroplane windows are round?

How many times do a clock's hands overlap in a day ?