Quantitative Aptitude - Arithmetic Ability Questions

The ratio of sand to gravel in a mixture is 7 : 8 while that between gravel and cement is 6 : 7. What is the ratio of sand to cement in the mixture?

Rahul can complete a work in 18 days and Sonu can complete the same work in 15 days. If both together work for 5 days, then what part of total work is left?

Two trains are moving in the same direction at the speed of 23 km/hr and 77 km/hr. The time taken by faster train to cross a man sitting in the slower train is 40 seconds. What will be the length (in metres) of the faster train?

If x+3y=-3x+y, then x22y2 is equal to

If a+1a=1,then the value of a2-a+1a2+a+1 is a≠0

Which of the below given fractions is NOT equal to 9/17?

Find 2 consecutive natural numbers, sum of whose squares is 25.

A man misses a train by 1 hour if he travels at a speed of 4 kmph. If he had increased his speed to 5 kmph, he would gave still missed the train by 24 minutes. At what speed should he have travelled so that he reached the station exactly on time?