Which of the following can be used to illustrate that not all prime numbers are odd? 

 

Product of digits of a 2-digit number is 27. If we add 54 to the number, the new number obtained is a number formed by interchange of the digits. Find the number.

A number is greater than twice its reciprocal by 31/4. Find the number.

Of the 3 numbers whose average is 64, the first number is 1/3 times the sum of other 2. The first number is

What is the value of 2 consecutive natural numbers, sum of whose squares is 145?

If the sum of a number and its reciprocal be 2, then the number is

Of the 5 numbers whose average is 76, the first is 3/7 times the sum of other 4. The first number is

The difference between the greatest and least five­ digit numbers formed by the digits 2,5,0,6,8 is (repetition of digits are not allowed)

Among three numbers, the first is twice the second and thrice the third. If the average of three numbers is 429, then what is the difference between the first and the third number?