Question

1. Rakesh can do a piece of work in 20 days. How much work can he do in 4 days?



2. Rohan can paint 1/3 of a painting in 6 days. How many days will he take to complete painting?


3. Anil can do a piece of work in 5 days and Ankur in 4 days. How long will they take do the same

work, if they work together?


4. Mohan takes 9 hours to mow a large lawn. He and Sohan together can mow in 4 hours. How long

will Sohan take to mow the lawn if he works alone?


5. A, B and C working together can do a piece of work in 8 hours. A alone can do it in 20 hours and B

alone can do it in 24 hours. In how many hours will C alone do the same work?


6. A and B can do a piece of work in 12 days; B and C in 15 days; C and A in 20 days. How much time

will A alone take to finish the work?


7. A pipe can fill a cistern in 10 hours. Due to a leak in the bottom it is filled in 12 hours. When the

cistern is full, in how much time will it be emptied by the leak?


8. An urn contains 10 red and 8 white balls. One ball is drawn at random. Find the probability that

the ball was drawn is white.


9. A dice is thrown. Find the probability of getting:

i. a prime number

ii. 2 or 4

iii. a multiple of 2 or 3.​

Answer 1

Answer:

prime numbers are 2,3,,5,7,.and etc are prime numbers

Answer 2

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