b) In an examination, there are three papers, each of 100 marks. A candidate obtained
64 marks in the first paper and 76 marks in the second paper. If he has to get an
overall score of 80%, how many marks does he need to score in the third paper?
c) Dhruvika invested money from May 2016 to April 2018 at a rate of 12% per annum.
If the interest received by her is 1,680, how much money did she invest?
d) In a test, 4 marks are given for every correct answer and -1 mark is given for every
incorrect answer. Rahul attempted all the questions and scored 64 marks, though
he only got 20 correct answers.
(i) How many of his answers were incorrect?
(ii) How many questions were given in the test?
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Answer:
Total marks =100+100+100=300
Let x marks obtained by the candidate in third paper
Marks obtained by the candidate in second paper =75
Mark obtained in first paper =53
Total marks obtained by the candidate =53+75+x−128+x
ACQ,
⇒(
300
128+x
)×100=70
⇒128+x=3×70
⇒x=210−128
⇒x=82
Step-by-step explanation:
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