Question

2. In a test (+5) marks are given for every correct answer and (-2) marks are given for every incorrect answer. Rosy attempted all the questions and scored (+65) marks though she got 15 correct answers. How many incorrect answers did she get?​

Answer 1

Answer:

If she has got 15 correct answer then she should have scored 15×5=75. But she has got 65. So 75-65=10 marks she has lost due to incorrect ans wers.

Number of incorrect answers=10/2=5

Answer 2

Answer:

We know that 5 mark for correct answer

and -2 for incorrect answer

Rosy get total marks=65

Rosy make total correct answer = 15 ×5 =75

so Rosy get negative mark = 75 - 65 =10

10÷2 =5

so Rosy get total incorrect answer =5