Question

In a test (+2)marks are given for every correct answer and (-1) marks for every incorrect correct answer. Mahu answered all the questions and scored 20 marks though he got​

Answer 1

Step-by-step explanation:

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