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Answer:
106
Step-by-step explanation:
Let the total number of correct questions be x and total number of wrong questions y,
Therefore, according to question,
x + y = 180 ____________ eq 1
4x - y = 450_____________eq 2
Therefore,
Adding equation 1 and 2, we get,
x + y = 180
+ 4x - y = 450
_______________________
5x = 530
therefore,
x = 530/5 = 106
Therefore, he answered 106 questions correctly.
Answer:
Answer is- 106
Explanation=
let the total number of correct questions be " X"
and total number of wrong questions "Y".
Therefore: According to question
x + Y = 180 ________ eq 1
4x- y = 450__________eq 2
5x= 530
x= 530/5 = 106
Therefore he answered 106 correct answers
This is your answer mate
Thank You