Question

a carpenter prepares a new chair in 3 days working 8 hours a day at least how many hours a day must he worked in order to make the same chair in 4 days. ( by unitary method)

Answer 1

Provided that,

The carpenter prepares a new chair in 3 days if he works 8 hours daily.

Hence following unitary method,

The carpenter prepares a new chair in 1 day if he works ( 8 * 3 ) hours.

On solving we get,

The carpenter prepares a new chair in 1 day if he works 24 hours.

Again following unitary method,

The carpenter prepares a new chair in 4 days if he works ( 24 / 4 ) hours daily.

Hence simplifying,

The carpenter prepares a new chair in 4 days if he works 6 hours daily.

Answer 2

Solutions :-

We have,
A carpenter prepares a new chair in 3 days working 8 hours a day.

Now,

Find how many hours a day must he worked in order to make the same chair in 4 days.

3 days = 8 hours
1 day = 8 × 3 = 24 hours

So,
4 days = 24/4 = 6 hours

Answer : 6 hours a day must he worked in order to make the same chair in 4 days.