Subject
Quantitative Aptitude
Topic
Number
A two-digit number is such that the product of the digits is When 18 is added to the number, then the digits are reversed. The number is:
A two-digit number is such that the product of the digits is When 18 is added to the number, then the digits are reversed. The number is:
ক)
18খ)
24গ)
42ঘ)
81Explanation
Let the ten's and unit digit be x and 8/x respectively. Then, (10x + (8/x)) + 18 = 10 x (8/x) + x => 10x2 + 8 + 18x = 80 + x2 => 9x2 + 18x - 72 = 0 => x2 + 2x - 8 = 0 => (x + 4)(x - 2) = 0 => x = 2.Related questions
On dividing 2272 as well as 875 by 3-digit number N, we get the same remainder. The sum of the digits of N is:Three times the first of three consecutive odd integers is 3 more than twice the third. The third integer is:A number is as much greater than 36 as the less than Find the number.If one-third of one-fourth of a number is 15, then three-tenth of that number is:If the number 5 * 2 is divisible by 6, then * =?কাজের দিন ২ টাকা পাওনা এবং অনুপস্থিতির দিন ৫০ পয়সা জরিমানা এই শর্তে সেপ্টেম্বর মাসে ৪০ টাকা পেল। সে কত দিন কাজে উপস্থিত ছিল?476 ** 0 is divisible by both 3 and The non-zero digits in the hundred's and ten's places are respectively:The sum of two numbers is 25 and their difference is Find their product.