Quantitative Aptitude - Arithmetic Ability Questions

In the following question, select the odd number group from the given alternatives.

If 7x ­- 5y = 13 and 2x -­ y = 5, then (x -­ y) is

A train runs at 80 kmph for the first 40 km and the next 30 km at 60 kmph. Find the average speed.

A can do a work in 24 days and B in 40 days. If they work on it together for 10 days, then what fraction of work is left?

A can do a work in 16 days and B in 20 days. If they work on it together for 8 days, then what fraction of work is left?

If 20 men working 8 hours per day can complete a piece of work in 21 days. How many hours per day must 48 men work to complete the same job in 7 days?

19 personswentto a hotel for a combineddinner party. 13 of them spent Rs 79 each on their dinner and the rest spent Rs 4 more than the average expenditure of all the 19. What was the total money spent by them?

The mean of the data 1, 2, 10, 18, 3, 17, 19 is