150 workers were engaged to finish a job in a certain number of days. 4 , workers dropped out on second day, 4 more workers dropped out on third day and so on. It took 8 more days to finish the work. Find the number of days in which the work was completed.

John and Ramesh took up a job on contract. John worked 7 days and Ramesh 6 days. They got 6500 rupees as wages which they divided in the ratio of the number of days each worked. How much did each get?

A man ate 100 grapes in 5 days. Each day he ate 5 more than what he ate the previous day. Can you find the number of grapes he ate eạch day?

A radioactive element t_(0.5) = 30 days is spread over a room, Its activity is 25 times the permissible value of safe working. Calculate the number of days after which the room will be available for safe working.

A class has 4 more girls than boys. One day when only 8 boys were absent, the number of girls were twice that of boys. How many girls and boys are there in the class?

The half life of a radioactive substance is 4.2 days. Find the time during which 1/8" of the sample will remain undecayed.

A manufacturur produces nuts and bolts.It takes 1 hour of work on machine A and 3 hours on machine B to produce a package of nuts. It takes 3 hours on machine A and 1 hour on machine B to produce a package of bolts.He earns a profit of Rs.17.50 per package on nuts and Rs.7 per package on bolts.How many package of each should be produced each day so as to maximise the profit,if he operates his machine for at the most 12 hours a days? Solve the LPP graphically and find the number of packages of nuts and bolts to be manufactured.

On Arts day,180 sweets were distributed equally among the students. Tasting one sweet Deepa said,“It is a pity that 9 of our friends are absent today.” Hearing this Deepu said “Because of that we got one sweet more”: Find out the total number of students.

The probability that a bulb produced by a factory will fuse after 150 days of use is 0.05. Find the probability that out of 5 such bulbs. not more than one

The probability that a bulb produced by a factory will fuse after 150 days of use is 0.05. Find the probability that out of 5 such bulbs. more than one