Question

In a test (+5) marks are given for every correct answer and (-2) marks are given every incorrect answer. Radhika answered all the questions and scored 30 marks though she got 10 correct answers . How many incorrect answers has she attempted.​

Answer 1

Answer: 10

Step-by-step explanation:

Let x be the number of incorrect answers she got. She got 10 correct answers.

5∗10+(−2)∗x=30

50−2x=30

−2x=30−50=−20

x=−20−2=10

Hence number of incorrect answers is 10.