Question

Ajay can do a work in 15 days and and Riya takes 20 days to the same work how many days they will take if they work together​

Answer 1

Answer:

12.5

Step-by-step explanation:

Only take the average of number and you will get answer.

Answer 2

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Let take Ajai can do a work in 1/15 days

Let take Riya can do a work in 1/20 days

Together they work = 1/15 + 1/20

$\: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: = \frac{1}{15} + \frac{1}{20}$

$\: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: = \frac{15 + 20}{15 \times 20}$

$\: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: = \frac{35}{300}$

$\: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: = \frac{7}{60}$