PFA the solution : Q. 7

18 = 2 x 9 so the number has to be divisible by 2 and 9 both. From the question it is clear that the number ends with 18 , hence it is divisible by 2 ...

0000 , 0001 , 0002 , 0003 , ........, 9999Number of digits used : 4 x 10000 = 40000Each digit used : 40000/10 = 4000times D(1) + D(2) + D(3) + …..+ D...

P1 ____P2 ____P3 ___......P20____P21 Distance travelled in 1 minute = 50 × 20 = 1000metres 1km in 1min. Hence speed : 60km/hr.

9 + 2(n-4) is a perfect square Two cases : (i)When ( n -4) is a perfect square 9 + x2 = y2 9 = y2 – x2 (x-y) (x+y) = 1 x 9 or 3 x 3 Solving this we ...

24 + 27 + 2n = 24 [ 1 + 23 + 2 (n -4) ]= 24 [ 9 + 2(n -4) ]9 + 2(n -4) has to be a perfect square . n = 8 is only possibility.

Hi Richa, The question seems to be incomplete... the speed of the policemen is not known.

If Nick walk half as fast as Bob then let him take t times the time Bob takes => escalator would move through 40t steps and he would take 20t/2 ste...

1. Let the escalator have a total of n steps and let it have moved through m steps by the time Bob took 20 steps. therefore since Sam runs twice as f...

a + b + c + d + e = 20 to make at least 3 ( a' + 3) + ( b' + 3) + ( c' + 3) + ( d' + 3) + ( e' + 3) = 20a' + b ' + c' + d' + e' = 5 Total : (5+5 -1)C(...

The average is 37 31/37 = 1400/37 we know that average of 1st n consecutive number is (n+1)/2 but average is 35 31/37 hence value of n should be clos...

If the question asks about 2015th number, then it will simply be 201520152015..... ( 2015 written 2015 times )

2015th number or 2015th digit ?