For the following questions answer them individually
P can do as much work as Q and R together can do. P and Q can together do a piece of work in 8 hours and 24 minutes and R can do it in 42 hours. Find the time (in hours) that Q needs to do the work alone.
Salary of a person is first decreased by 40 percent and then increased by 40 percent. What will be the percentage decrease in the salary ?
Find the total surface area of a cylinder whose height is 8.5 mm and the base diameter is 10 mm.
Excluding the stoppages, the speed of a truck is 90 km/h and including the stoppages, the speed of the truck is 36 km/h in a journey. For how many minutes does the truck stop per hour?
A dealer offers 20% discount on all dolls. He offers a further discount of 5% on the reduced price to those customers who pay in cash. How much will a customer pay in cash for a doll worth Rs.1,800?
In a storm 243 trees were left standing out of 300 trees in a garden. What is the percentage decrease in number of trees?
A shopkeeper sells his goods at 10 percent loss on cost price but uses 30 percent less weight. What is his profit?
If 6 men or 8 women can reap a field in 21.5 days. How long will 14 men and 10 women take to reap it?
Rita buys a toy car for Rs.12,000 and sells it for Rs.14,500. What is her gain percent? (rounded off to two digits after decimal)