In online test, (+3) marks are award for a correct answer and (-1) marks for a worng answer . Rajeev got a total of 20 marks, if he answer 12 questions correctly, them how many question did hr answer worng
Answers
Answer:
Answer
1) Radhika scored 12×3=36 marks. as 3 marks are for correct answer
final score of radhika is 20.
she got 16 marks negative. as −2 marks are for incorrect answer
therefore she made
2
16
=8 incorrect answer.
2) Mohini scored 7×3=21 marks. as 3 marks are for correct answer
final score of radhika is −5.
she got 26 marks negative. as −2 marks are for incorrect answer
therefore she made
2
26
=13 incorrect answer.
Given :- , (+3) marks are award for a correct answer and (-1) marks for a worng answer . Rajeev got a total of 20 marks .
To Find :- If he answer 12 questions correctly, them how many question did he answer wrong ?
Solution :-
Let us assume that, rajeev answered x question wrong.
so,
→ Total question he answered correctly = 12
and,
→ Total Marks marks for each correct answer = (+3)
then,
→ Total marks scored by rajeev for correct answer = 12 * 3 = 36 marks .
now,
→ Total question he answered wrong = x
and,
→ Total Marks marks for each wrong answer = (-1)
then,
→ Total marks scored by rajeev for wrong answer = x * (-1) = (-x) marks .
A/q,
→ Total marks he scored = 20
→ 36 - x = 20
→ x = 36 - 20
→ x = 16 (Ans.)
Hence, Rajeev answered 16 question wrong .
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