Question

In a class test, 5 marks are given for each
correct answer and -2 for each incorrect
answer. Aaryav answered all the questions
and scored 30 marks, though he got 10 correct
answers. Find the number of questions Aaryav
answered incorrectly.​

Answer 1

Answer:

20

Step-by-step explanation:

$30 - 10 = 20$

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Answer 2

Let the no of incorrect answers attempted by aaryav be 'a'

No of marks alloted for correct answers = 5

No of marks deducted for incorrect answers = (-2)

No of correct answers attempted by aaryav = 10

No of marks alloted for 10 correct answers = 10(5) = 50

No of marks deducted for 'a' correct answers = (-2)a = -2a

Total marks scored by aaryav = 30

According to the question ,

50 + (-2a) = 30

=> -2a = -20 => a = 10

∴ No of incorrect answers attempted by aaryav = 10