Question
In a two digit positive number, the digit in the
unit’s place is equal to the square of the digit in ten’s place, and the difference between the number and the number obtained by interchanging the digits is 54. What is 60% of the original number?Solution
Let the number = 10x + x 2 According to the question, 10x + x2 - (10x2 - x) = 54 9(x2 - x) = 54 x 2 - x = 6 x2 - x – 6 = 0 ( x - 3) (x + 2) = 0 x = 3 or x = -2 Number = 39 [x ≠ 2] => 60% of 39 = (60/100) × 39 = 23.4
David is ranked 15th from the top in his class. When counted from the bottom, he is ranked 126th. What is the total number of students in the class?
In a code language, 'PYRAMID' is written as 98, 'TOMB' is written as 50. How is 'RUINS' written in the same code language?
In a certain code language, "ACTION" is written as "MLRGXZ", and "TRAVEL" is written as "OVEZIG". How will "DESIGN" be written in that language?
Answer the following questions based on the information given below.
Seven persons T, U, V, W, X, Y and Z has different weights. T is heavier t...
(1) Punishment   Â
(2) Arrest      Â
(3) Crime      Â
(4) Judgment
...Among seven students D, E, F, G, H, I and J. I is heavier than J but lighter than G. F is heavier than E. D is the heaviest. E is fourth heaviest. H is ...
Who among the following person lives three floors above E?
Six persons S, T, U, V, W and X have different weights in kg. T is heavier than U but lighter than S, who is the second heaviest among all. W is lighter...
Among Jyoti, Kaya, Lovely, Mahesh and Nalini each of them is different height.
Mahesh’s height is more than only three persons. Kaya’s height...
There are 38 persons in a row, in which A is 8th from the left and B is 12nd from the right side of the row. Find out no of people between A and B.
Relevant for Exams:
