Quantitative Aptitude - Arithmetic Ability Questions

Ratio of present ages of P and Q is 9 : 4. The difference between their ages is 20 years. What will be the sum (in years) of their ages after 10 years?

To go a distance of 40 km upstream a rower takes 8 hours while it takes her only 5 hours to row the same distance downstream. What was the rower's speed in still water?

If  C+1C = 3, then what is the value of C3+1C3 = ?

If a : b is 32 : 35 and b : c is 21 : 32, then a : c is?

If sec -5π/4 = x, then the value of x is

The weights of two iron balls are 3.5 kg and 7.5 kg. What is the percentage weight of the 1st ball with respect to 2nd ball.

The discount offered on a Shirt of Rs 500 and a pair of Trousers of Rs 1000 is 20% and 40% respectively. If Ajay bought 2 Shirt and 3 pair of Trousers then what was the effective discount ( in %) he recieved?

When a number is increased by 21, it becomes 114% of itself. What is the number?