Working in separately , three carpenters can make three chairs in three days. how many chairs can 7 carpenters working at the same rate make in 30 days?

if you use photomath right away it will give you the answer not like this app that you have to wait for people.

option a is correct.

step-by-step explanation:

scale factor: it is used to find proportional measurements.

proportions means having the same ratio.

scale factor is the ratio of the model measurement to the actual measurement in a simplest form.

or we can say that the ratio of any two corresponding lengths in two similar geometric figures

if the scale factor is more than 1, then it is an enlargement,

if the scale factor less than 1, then it is a reduction.

given the two geometric figure:

by definition of proportions, we have