In a class test (+3 ) marks are given for every correct answer and (-2 ) marks are given for every incorrect answer and no marks for not attempteing any question.
a) radhika scored 20 marks.if she has got 12 correct answers,how many questions has she attempted incorrectly?
b) mohini scores (-5 ) marks in this test, though she has got 7 correct answers.how many questions has she attempted incorrectly?
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Answer:
a)
Let total no. of incorrect answers be x.
A.T.Q.
20 = 3 × 12 - 2 × x
20 = 36 - 2x
2x = 36 - 20
2x = 16
x = 8
b)
Let the no. of incorrect answers be x.
A.T.Q.
-5 = 7 × 3 - 2x
21 + 5 = 2x
26 = 2x
x = 13
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