Verified Answer :

since 120 is 60 percent we know that 2/3120+120 will be 100 percent 

2/3120=80
so 80+120=200

So, full marks is 200

percentage is a value by a fraction of 100.
120 marks is equivalent to 60%
this means from the whole amount, 60 % of the whole amount is 120 marks
we need to find the full marks
if 60 % --- 120 
then 1 % --- \(\frac{120}{60}\)
full marks are 100 %
therefore 100 % - \(\frac{120}{60} * 100\)
100 %  --- 200 marks 
full marks are 200 marks 

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