Question

In a test $(+5)$ marks are given for every correct answer and $(-2)$ marks given for every incorrect

answer. Radhika answered all the questions and scored $30$ marks though she got the $10$ correct

answers. ii) Jay also answered all the questions and scored $(-12)$ marks though he got $4$ correct

answers. How many incorrect answers had they attempted?

Answer 1

Marks given for one correct answer = 5
So, marks given for 10 correct answers
= 5 X 10 = 50
Radhika's score = 30
Marks obtained for incorrect answer
= 30- 50 = -20
Marks given for one incorrect answer
= (-2)
Therefore, number of incorrect answers
= $(-20)÷(-2)=10$