Aptitude ➤ Problems On Numbers ➤ Set 1

#### Problems On Numbers : Important Facts and Formulae

In this section, questions involving a set of numbers are put in the form of a puzzle. You have to analyze the given conditions, assume the unknown numbers and form equations accordingly, which on solving yield the unknown numbers.
Question 6
Q6.  A number is doubled and 9 is added. If resultant is trebled, it becomes 75. What is that number ?
Question 7
Q7.  Three times the first of three consecutive odd integers is 3 more than twice the third. The third integer is :
Question 8
Q8.  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 ?
Question 9
Q9.  Find a positive number which when increased by 17 is equal to 60 times the reciprocal of the number.
Question 10
Q10.  A two-digit number is such that the product of the digits is 8. When 18 is added to the number, then the digits are reversed. The number is :