11.

A man can do a piece of work in 30 hours. If he works with his son then the same piece of work is finished in 20 hours. If the son works alone he can do the work in 

• 60 hours

• 50 hours

• 25 hours

• 25 hours

A water tap fills a tub in 'p' hours and a sink at the bottom empties it in 'q' hours. If p < q and both tap and sink are open, the tank is filled in 'r' hours; then

• 
• 

• r = p  +q

• r = p  +q

John does  piece of work in 3 hours. Joe does  of the remaining work in 1 hour and George finishes remaining work in 5 hours. How long would it have taken the three working together to do the work?

A does  of a work in 9 days. Then B joined him and they together completed the remaining work in 6 days. B alone can finish the whole work in

• 
• 

• 10 days

• 10 days

The daily wages of A and B respectively are Rs. 3.50 and Rs. 2.50. When A finishes a certain work, he gets a total wage of Rs. 63. When B does the same work, he gets a total wage of Rs. 75. If both of them do it together, what is the cost of the work ?

• Rs. 67.50

• Rs. 27.50

• Rs. 60.50

• Rs. 60.50

A man does double the work done by a boy in the same time. The number of days that 3 men and 4 boys will take to finish a work which can be done by 10 men in 8 days is

• 4

• 16

• 
• 

The marked price of an article is 30% higher than the cost price. If a trader sells the articles allowing 10% discount to customer, then the gain percent will be

• 17

• 20

• 19

• 19

A merchant marked the price of an article by increasing its production cost by 40%. Now he allows 20% discount and gets a profit of Rs. 48 after selling it. The production cost is

• Rs. 320

• Rs. 360

• Rs. 400

• Rs. 400

A watch dealer pays 10% custom duty on a watch which costs Rs. 500 broad. He desires to make a profit of 20% after giving a discount of 25% to the buyer. The marked price should be

• Rs. 950

• Rs. 800

• Rs. 880

• Rs. 880

A shopkeeper allows 20% discount on his advertised price and to make a profit of 25% on his outlay. What is the advertised price (in Rs.) on which he gains Rs 6000?

• 36000

• 37500

• 39000

• 39000