Quantitative Aptitude - Arithmetic Ability Questions

From well shuffled standard pack of 52 playing cards,one card is drawn. What is the probability that it is either a red card or black card?

Tushar takes 6 hours to complete a piece of work, while Amar completes the same work in 10 hours. If both of them work together, then what is the time required to complete the work?

If 30% of 40% of X is 240, then what is the value of X?

Given a principal of $12,000 with a compound amount of $17,631.94 and interest rate of 8% compounded anually,what is the time peroid in years?

How much water (in litres) must be added to 80 litres solution of milk and water containing 10% milk, so that it becomes a 5% milk solution?

If a > b > 0, AB = a - b cm, BC = 2√ab cm, then ∠ABC is

Rs 60500 is divided among A, B and C such that A receives 2/9 as much as B and C together and B receives 3/7 of as much as A and C together. What is the share of C (in Rs)?

One card is drawn from deck of 52 cards, each of the 52 cards being equally likely to be drawn. Find the probability that the ball drawn is red.