1 Answers

Option 1 : Only I

From Statements I: 

60% - 40% = 120 

∴ 20% = 120 

1%  = 6

100% = 600

According to statement II: 

As there is no numerical value provided in the statement II so we will be able to find the exact number of boys in the class

∴ statement I alone is sufficient to answer the question

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