35If one-third of one-fourth of a number is 15, then three-tenth of that number is:

The sum of squares of three numbers is 138 and the sum of their products taken two at a time is 131. Find their sum.

 If x, x+2 and x+4 are prime numbers, then find the number of possible solutions for x.

Sum of two positive numbers are multiplied by each number separately. The products thus obtained are 510 and 390. What is the difference of the two numbers?

A number consists of two digits. If the digits interchange places and the new number is added to the original number, then the resulting number will be divisible by:

Three times the first of three consecutive odd integers is 3 more than twice the third. The third integer is:

The difference between a two-digit number and the number obtained by interchanging the digits is 36. What is the difference between the sum and the difference of the digits of the number if the ratio between the digits of the number is 1 : 2 ?

In a two-digit, if it is known that its unit's digit exceeds its ten's digit by 2 and that the product of the given number and the sum of its digits is equal to 144, then the number is:

If one-third of one-fourth of a number is 15, then three-tenth of that number is:

The sum of the digits of a two-digit number is 15 and the difference between the digits is 3. What is the two-digit number?