Question

Purvi and Sanchi can paint a room in 14 days. If Sanchi can alone paint the room in 21 days then in how many days Purvi alone can paint the room
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Answer 1

Answer:

21 days

Step-by-step explanation:

Sanchi in 21 days can paint = 1 room

So in 1 day Sanchi can paint = 1/21 of room

Let Purvi take x days to paint 1 room

So in 1 day Purvi can paint = 1/x of room

Together they can paint the room in 14 days

So,

14[(1/21 + 1/x)] = 1

x = 21 days