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 questions she would have to answer correctly to earn 60% of the passing grade?
Choose the most appropriate option
A) 3
B) 2
C) 6
D) 5
E) 4
Number of questions attempted correctly   =(70% of 10 + 40% of 30 + 60% 0f 35)   =7 + 12+21= 45   questions to be answered correctly for 60% grade=60% of 75 = 45   therefore required number of questions= (45-40)= 
<gadget id="calculator">(45-40)</gadget>
<output>5</output>
5   Answer is 5.
<result>D</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% of 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 to answer correctly to earn 60% of the passing grade?