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% 0f the geometry problems correctly, she did not pass the test because she got less than 60% of the problems right. How many more questions she would have needed to answer correctly to earn a 60% passing grade?
Pick one.
A) 5
B) 10
C) 15
D) 20
E) 25
Solution   Number of questions attempted correctly   = (70% of 10 + 40% of 30 + 60% of 35)   = (7 + 12 + 21)= 
<gadget id="calculator">(7 + 12 + 21)</gadget>
<output>40</output>
40.   Questions to be answered correctly for 60% grade= 60% of 75 = 45.   Required no of questions = (45 - 40)= 
<gadget id="calculator">(45 - 40)</gadget>
<output>5</output>
5.   5nswer 5
<result>A</result>
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% 0f the geometry problems correctly, she did not pass the test because she got less than 60% of the problems right. How many more questions she would have needed to answer correctly to earn a 60% passing grade?