self Maths Puzzle

Q. Dinesh and Dipu can design an application software in 16 hours and 12 hours. Dinesh joins Dipu 4hrs before work completes. Dipu had started the work alone. Find how many days Dipu worked alone?

Read Solution (Total 2)

5 hrs
They together completed 4*(1/16 +1/12) project = 7/12 project in 4 hrs.
balance 5/12 project is completed by DIPU alone in 5 hrs.
11 years agoHelpfull: Yes(3) No(0)

work by dinesh in 1Hour=1/16 and dipu in 1Hour=1/12.
they both in 1hour=(1/16+1/12)=7/48.
they both work in 4 hour=4*(7/48)
remain work=(1-28/48)=20/48
dipu work alone (12*20/48)=5Hours=5/24 Days.
11 years agoHelpfull: Yes(0) No(2)

self Other Question

Q. The distance between the towns A and B is 1000 miles. There is 3000 apples in A, and the apples have to be delivered to B. The available car can take 1000 apples at most. The car driver has developed an addiction to apples: when he has apples aboard he eats 1 apple with each mile made. Figure out the strategy that yields the largest amount of apples to be delivered to B. Q. Calculate no of zero in 126! and 99!