Question

Harry and Sharry can together plant saplings in a field in 6 days. If Harry works alone, he takes 3 additional days to plant the saplings. If Sharry was to work alone, how many days will he need to finish the work?

Answer 1

Answer:

We can solve this question quickly by using a little number sense.

Sally can paint a house in 4 hours

So, if there were TWO Sallys, they'd be able to paint the house in HALF the time.

In other words, TWO Sallys could paint the house in 2 hours

John can paint the same house in 6 hours

So, if there were TWO Johns, they'd be able to paint the house in HALF the time.

In other words, TWO Johns could paint the house in 3 hours

So, the time it takes Sally and John to paint the house will be BETWEEN 2 hours and 3 hours