A stamina is 75% more than B. A complete a work in 20days,if A and B work together how many days required for the compilation of same work?
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Answer:
THEY COMPLETE IN 84/11 = 7 7/11 DAYS
Step-by-step explanation:
let B can complete in d days
one day work done by B = 1/d
A as 75% more efficient than B
One day work done by A = 1/d + 75/[100]d
=1/d +3/[4d]
A can complete in 12 days
One day work done by A = 1/12
1/d +3/[4d] =1/12
4/4d +3/4d =1/12
7/4d =1/12
7x12/4 =d
d =21
B can complete in 21 days
One day work done by A and B = 1/12+1/21 =7/84 +4/84 =11/84
THEY COMPLETE IN 84/11 = 7 7/11 DAYS
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