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 scored30 marks she got 10 correct answers.

Answer 1

total no. of correct answer = 10
total marks gained by correct answer = 50
scored marks = 30
marks lost due to incorrect answer = 50-30=20
total no. of incorrect answer = 20/2= 10
there were total 20 questions in the exam

Answer 2

let the number of incorrect Answers be X
number of correct answer = 10
marks for every correct answer=+5
total marks she got for correct Answers= 5×10= 50

50+(-2)X=30
50 -2x=30
50- 30= 2x
20 = 2x
X= 20 /2
x=10
number of incorrect answer =10