If 21x = 79x, what is the value of x?

Can you think of a smallest +ve number such that if we shuffle the digits of the number, the new number becomes double the original number?

A mathematics teacher took exams for his students. Out of the total students, 25% passed both the tests included in the exam. However, only 42% were able to clear the first test.

Can you find out the percentage of those students who passed the first test and also passed the second test?

How do you go from 98 to 720 using just one letter?

If one and a half boys, eat one and a half burgers in one and a half hours.

How many burgers can 9 boys eat in 3 hours?

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?

The product of three consecutive numbers is 7980.
Then the sum of these consecutive numbers would be?

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

James ordered a fishing rod, priced at $3.56. Unfortunately, James is an Eskimo who lives in a very remote part of Greenland and the import rules forbid any package longer than 4 feet to be imported. The fishing rod was 4 feet and 1 inch, just a little too long, so how can the fishing rod be mailed to James without breaking the rules? Ideally James would like the fishing rod to arrive in one piece!

Quickly Solve this riddle

7 - 4 + 3 * 0 + 1 = ?