Question

There are 180 multiple choice questions in a test. candidates gets 4 marks for every correct answer and for every Un attempted or wrongly answer questions one mark is deducted from the total score of correct answer If a candidate scored 450 marks in the test how many questions did he answer correctly? ​

Answer 1

Answer:

126

Step-by-step explanation:

Let the number of correctly answered questions be x.

Let the wrongly answered questions be y.

Then,according to the question,

x+y=180 and 4x−y=450

Adding these two equations,

x+y+4x−y=450+180

5x=630

x=126

From the above equation,

126+y=180

y=54

Therefore, 126 questions are answered correctly

HOPE IT HELPS!