Shobha 39 s Mathematics test had 75 problems i e 10 arithmetic 30 algebra and 35 geometry problems A...........

Quant (SSC) Percentage

Shobha's Mathematics test had 75 problems i.e. 10 arithmetic, 30 algebra and 35 geometry problems. Although she answered 70% of the arithmetic, 40% of the algebra and 60% of the geometry problems correctly, she did not pass the test because she got less than 60% of the problems right . How many more question she would have needed to answer correctly to earn a 60% passing grade?

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Explanation:

Number of questions attempted correctly
= (70% of 10 + 40% of 30 + 60% of 35 )
⇒   (7 + 12 + 21)   =   40.
Questions to be answered correctly for 60% grade = 60% of 75 = 45 .
So, Required number of questions = (45 –  40) = 5.