When 99 is considered higher than 100?

What does the below mathematical rebus mean?

How will you measure 15 minutes using two hourglasses of 7 minutes and 11 minutes respectively?

Twice ten are six of us,

Six are but three of us,

Nine are but four of us;

What can we possibly be?

Would you know more of us?

Twelve are but six of us,

Five are but four, do you see?

What are we?

Why is a river so rich ?

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

Can you find out which options fits best with the missing column?

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?

If eleven plus two equals one, what does nine plus five equal?

Find the smallest sentence with all the English alphabet.