ajay gets 20% less marks than that of vatsal's marks by what percent vatsal's marks is more than ajays marks.
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let vatsal marks is equal to x and ajay gets 20% less marks than vatsal
⇒ ajay marks = x - 20x/100 = 4x/5
the difference between vatsal and ajay marks is x - 4x/5 = x/5
⇒ vatsal has x/5 marks more than ajay
⇒ the percentage by which vatsal's marks is more than ajays marks is :
⇒ x/5 × 5/4x × 100
⇒ 1/4 × 100 = 25%
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