The ratio, load/effort is called mechanical advantage of a machine. The mechanical advantage should be greater than one. If, in a machine, the ratio is less than one, it would be more accurate to call is mechanical disadvantage.
The ratio
is called the velocity ratio of a machine. The two distances are moved in the same interval of time, so they are proportional to the velocities of the effort and load.
P×d1 = W×d2 in a perfect machine.
or
where d1 and are d2 are the distances moved by effort P and load W respectively. Hence, in a perfect machine the mechanical advantage is equal to velocity ratio.
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Efficiency of Machine:
In all machines some work is always wasted friction. The result of it is that the work done by the effort in a given time, called total work or work input (= p × d1) is always greater than the work done on the load (= W × d2) called useful work or work output. The difference of the latter from the former = lost work (Pd1-Wd2).
The ratio 
is called efficiency of machine. It is also defined as the ratio
In any actual machine the efficiency is always less than one but in a perfect or ideal machine in where there is no friction at all the efficiency is equal to unity.
Or Mechanical advantage = Efficiency × velocity ratio
i.e. M.A. =Velocity Ratio × η
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i think solution is clear now or numerical value might be
3/2 * .75== 3/2 * 3/4== 9/8==
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