There are 180 multiple choice questions in a test . A candidate gets 4 marks for every correct answer , and for every un-attempted or wrongly answered questions one mark is deducted from the total score of correct answers If a candidate scored 450 maks in the test how many questions did he answer correctly ? please it's very urgent. lt's a competition between me and my classmate
Answers
Answer:
126
Step-by-step explanation:
Let the number of correctly attempted questions be x
so, the number of unattempeted or wrong question = 180-x
total marks for correct attemptions = 4x
and total marks for unattempeted or wrong question = -1 (180-x)
= x - 180
as total marks = sum of attempted and unattempeted or wrong question = 180-x
450 = 4x + x - 180
450 = 5x -180
630 = 5x
126 = x
so, the number of correctly attempted =126
Answer:
total number of questions=180
for every correct answer =4 marks
for every wrong answer = -1 mark
marks obtained in exam=450
correctly answered questions= x
wrongly answered questions = 180-x
Step-by-step explanation:
obtained marks correctly answered questions=4x
obtained marks wrongly answered questions=-1(180-x)=-180+x
=4x-180+x=450
5x-180=450
5x=450+180 reference
5x=630 correctly=126*4=504
x=630/5 wrongly answer =-54
x=126 total marks gained=450
correctly answered questions=126
wrongly answered questions =54