Question

A can do a piece of work in 20 days and B in 25 days. How long

will they take together to finish it​

Answer 1

Answer:

a=20

b=25

ain 1 day =1/20

b in 1 day= 1/25

they together= 1/20+1/25

=9/100 theres it

Answer 2

Answer:

Work done by A = 20 days

Work done by A in 1 day = 1/20

Similarly, Work done by B in 1 day = 1/25

Now, they will work together in 1 day =

Work done by A in 1 day + work done by B in 1 day

$→\frac{1}{20} + \frac{1}{25}$

$→\frac{25 + 20}{500} = \frac{45}{500}$

$→ \frac{9}{100}$

Now, No. of days taken by A and B to complete the work together is 100/9 days = 11.11 days

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