Let p be a two-digit number and q be the number consisting of same digits written in reverse order. If p x q = 2430, then what is the difference between p and q?
45
27
18
9
The given product p × q = 2430 ...(i) The last digit is 0, so one two of the digits must be 5 and other one an even number 2, 4, 6 or 8. Let this unknown digit be x. So, p = 10x + 5 and q = 50 + x putting in (i), (10x + 5) × (50 + x) = 2430 Now, try 2, 4, 6 and 8, x = 4 Therefore, p = 45 and q = 54 Required difference = q - p = 54 – 45 = 9
For election to the Lok Sabha, a nomination paper can be filed by
Miscellaneous · Easy
In a month if the seventh day is three days earlier than Saturday,then the nineteenth day of the month will be a
Miscellaneous · Easy
Which among the following events happened earliest ?
Miscellaneous · Easy
An 80-litre solution of alcohol and water has 75% alcohol. How much water (in litres) must be added to bring down the concentration of alcohol to 60%?
Miscellaneous · Easy