Sum of the digits of two digit number is 9. The number obtained by interchanging the digit is 18 more than twice the original number. The original number is:
1) 72 2) 27 3) 36 4) 63
The system of equation x +2y =6 , 3x + 6y = 18
1) Is inconsistent 2) Has an infinite number of solution 3) Has a unique solution 4) None of these
Five years ago the sum of ages of the father and the son was 40 years. In present it's ratio is 4:1, then the present age of father is………..
1) 30 yr 2) 40 yr 3) 45 yr 4) 42 yr
The value of k for which the system of equations kx - y = 2, 6x - 2y = 3 has a unique solution, is_______.
1) = 3 2) ≠ 3 3) ≠ 0 4) = 0
A man can row three quarters of a km against the stream in minutes and return in minutes. The speed of man in still water is:
1) 2 km/h 2) 3 km/h 3) 4 km/h 4) 5 km/h
Two numbers are in the ratio 3: 4. If 5 is subtracted from each .then the ratio will be 2:3. What is the smallest number?
1) 15 2) 18 3) 20 4) 24
