Quantitative Aptitude - Arithmetic Ability Questions

Choose the odd word/letters/number/number pair from the given alternatives.

When [x + (1/x)] = 5, then what is the value of [x – (1/x)]?

A can do a work in 15 days and B in 20 days. If they work on it together for 6 days, then what fraction of work is left?

A flask has two holes. The 1st hole alone makes the flask empty in 9 minutes and 2nd hole alone makes the flask empty in 16 minutes. If water leaks out at a constant rate, how long in minutes does it take if both the holes together empty the flask?

Find the greatest number which on dividing 1580 and 3800 leaves remainders 8 and 1 respectively.

1.1 + 12.12 + 123.123 = ?

In triangle ABC, ∠ABC = 90°. BP is drawn perpendicular to AC. If ∠BAP = 50°, then what is the value (in degrees) of ∠PBC?

The 3rd and 8th term of an arithmetic progression are -13 and 2 respectively. What is the 14th term?