Quantitative Aptitude - Arithmetic Ability Questions

A can do a work in 21 days and B in 42 days. If they work on it together for 7 days, then what fraction of work is left?

P and Q can do a project in 60 and 30 days respectively. In how many days can they complete 90% of the project if they work together?

P, Q and R alone can complete a work in 12, 15 and 20 days respectively. In how many days will they together complete the same work?

Chandan is 2 years older than Ankit but 1 year younger than Sumit. Ankit is twice as old as Khushboo. If Khushboo's age is 25 years, what is the age (in years) of Sumit?

The average of a,b,c is 20 and that of b,c,d is 25; if d=30, then the value of a is

If 70% of total articles are sold at a profit of 20% and remaining articles are sold at a loss of 20%, then what will be the overall profit percentage?

Chords PQ and RS of a circle extended externally intersect at point T. Length of the segment PT, if lengths of QT, RT and ST are 9 cm, 18 cm and 6 cm respectively, is

In a shop 4.5% of 1500 kg toor dal was sold. Find the quantity sold