Interview Maths Puzzle Numerical Ability

what percentage of the no from 1 to 50 have square that end in lost digit 1?

Read Solution (Total 2)

is it 2%.only 1 square ends up in 1..100/50=2%
9 years agoHelpfull: Yes(0) No(2)

sorry its 20%. as 1,9,19,21,29,31,39,41,49.. total 10 numbers hence 20%
9 years agoHelpfull: Yes(0) No(2)

Interview Other Question

It cost 10 cents a km to fly and 12 cents a km drive. If you travel 20 km's, flying 'y' km's of distance and drive the rest then the cost of the trip in dollar is? Engine is of length 12m. A and B are 2 bogies of 10m length each. Engine can turn only in obtuse angles but not in acute angle. For example Engine can turn as FEH but not as FEA. Now, the task is that I have to exchange the positions of A and B with the help of Engine and the engine should remain at the same place.

https://www.facebook.com/photo.php?fbid=1154066181277608&set=gm.396813263860392&type=1