Math, asked by janokibarua, 1 month ago

A is thrice as efficient as B and therefore able to finish a work in 80 days less than B. Find the time in which they can do it working together. (a) 30 day (b) 20 days (c) 24 days (d) 25 days (e) None of these​

Answers

Answered by stusrivattsan9868
0

1st method:

A and B complete a work in = 15 days

One day's work of (A + B) = 115

B complete the work in = 20 days;

One day's work of B = 120

Then, A's one day's work

=115−120=4−36=160

Thus, A can complete the work in = 60 days.

2nd method:

(A + B)'s one day's % work = 10015

= 6.66%

B's one day's % work = 10020

= 5%

A's one day's % work = 6.66 - 5 = 1.66%

Thus, A need = 1001.66

= 60 days to complete the work

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