What wou
(b) Multiplicat
a and b
6. In a class test (+ 3) marks are given for every correct answer and
are given for every incorrect answer and no marks for not attempt
many questions has she attempted incorrectly? (ii) Mohini scores-5 mars
question. (i) Radhika scored 20 marks. If she has got 12 correct and
test, though she has got 7 correct answers. How many questions (d) Multiple
(c) The intes
integer
attempted incorrectly?
three is
Answers
Answer:
3 really appreciate ans
Given :- 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 attempting any question. Mohini scores -5 marks in this test, she has got 7 correct answers. How many questions has she attempted incorrectly ?
Solution :-
Let us assume that, she attempted x questions incorrectly .
so,
→ 7 * 3 + x * (-2) = (-5)
→ 21 - 2x = (-5)
→ 21 + 5 = 2x
→ 2x = 26
→ x = 13 (Ans.)
also, Radhika scored 20 marks and she has got 12 correct .
→ 12 * 3 + x * (-2) = 20
→ 36 - 2x = 20
→ 36 - 20 = 2x
→ 16 = 2x
→ x = 8 (Ans.)
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