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Let the total marks be x.

1st condition:-

20 per cent of x.......

canidate fails by 60 marks

therefore passing marks will be equal to=

20/100 of x +60.......i

2nd condition:-

he gets 320 and fails by 40 therefore passing marks equal to 320+40= 360.....ii

Now equating i and ii:-

since passing marks wiil be equal:-

i=ii

20/100 of x +60= 360

1/5 of x= 360-60

x= 300*5

x= 1500

therefore total marks = 1500 option 2