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Question
75% of students of a class answered Question No. 1 correct and 55% answered Question No. 1 correct and 20% answered neither question correctly . What percent of students answered both question correctly ?
20%
25%
35%
45%
50%
ANSWER : 5
Descrption
<p>Students answer Q.1 or Q.2 or both correctly = ( 100 - 20) = 80%</p> <p>Let, x% students answered both correctly</p> <p>( 75 - x) + ( 55 - x) + x = 80 </p> <p>130 - x = 80 </p> <p>x = 50 </p>
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