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part 1
the requested advantage is given by the subsequent ratio:
\[\large R = \frac{{72}}{{25}}\]

oh okay! so we get 2.88 is the requested mechanical advantage?

yes! Whereas the efficiency E, of our machine, is:
\[\Large E = \frac{{25}}{{72}} = ...\]

ohh okay! it is 0.347222....

no, it is an additional information only.
Our answer, to part 1 is 2.88

oh ok! so we do not need to include the efficiency? just the 2.88 mechanical advantage?

yes!

okie! so onto part 2!

so we have:
\[\Large L = \frac{{72 \times 12.3}}{{25}} = ...meters\]

we get 35.424!

correct!

so is that the amount of how much rope must be pulled? 35.424 m?

yes!

ok! yay!! so onto part 3?

ok! so we get 22.14 Newtons! is that our solution for part 3?

oh wait, that is just the force, right? how can we find the efficiency?

the new advantage is:
\[\Large R = \frac{{72}}{{22.14}} = ...\]

or how can we find how it affects the efficiency?

whereas the new efficiency, is:
\[\Large E = \frac{{22.14}}{{72}} = ...\]

I think that your problem asks for efficiency, also in part #1

so the answer to part #1 is:
\[\Large E = \frac{{25}}{{72}} \cong 0.35\]

that's right! the new efficiency is:
\[\Large E = \frac{{22.14}}{{72}} \cong 0.31\]

namely the efficiency will decrease

yes:)
and yay!! so that is how it affects efficiency? it will decrease?

yes! correct!

yay! thanks!! so we are done?

yes! we have finished!

yay!! ok! onto the next!!:)

thank you!!

:) :)