self Maths Puzzle Numerical Ability Time and Work

Abhishek starts to paint a fence on one day. On the second day, two more friend of Abhishek join him. On the third day 3 more friends of him join him and so on. If the fence is completely painted this way in exactly 20 days, then find the number of days in which 10 girls painting together can paint the fence completely, given that every girl can paint twice as fast as Abhishek and his friends(Boys)?(Assume that the friends of Abhishek are all boys).

Read Solution (Total 2)

The number of boys-days

first day,second day,third day......................20th day

[1+(1+2)+(1+2+3)+………..+(1+2+3+....+20)]=1540

every girl can paint twice as fast as boys(G=2B)
⇒ But , each boy =12 girls⇒ 770 girl-days.

⇒ 10 girls will take 77010= 77 days.
8 years agoHelpfull: Yes(2) No(1)

The number of boys-days

first day,second day,third day......................20th day

[1+(1+2)+(1+2+3)+………..+(1+2+3+....+20)]=1540

every girl can paint twice as fast as boys(G=2B)
⇒ But , each boy =12 girls⇒ 770 girl-days.

⇒ 10 girls will take 77010= 77 days.
8 years agoHelpfull: Yes(0) No(1)

self Other Question

If A and B work together, they will complete a job in 7.5 days. However, if A works alone and completes half the job and then B takes over and completes the remaining half alone, they will be able to complete the job in 20 days. How long will B alone take to do the job if A is more efficient than B?
A and B undertake to do a piece of work for Rs 600. A alone can do it in 6 days while B alone can do it in 8 days. With the help of C, they can finish it in 3 days, Find the share of C?