A mathematics test has 50 questions. Four points are given for each correct answer and one point is deducted for each incorrect
answer. If Khadija scored 70, then the number of questions she answered incorrectly was?
1 answer:
Answer:
26
Step-by-step explanation:
If x is the number of correct answers, and y is the number of incorrect answers, then:
x + y = 50
x (4) + y (-1) = 70
Solve the system of equations using substitution or elimination. Using substitution:
x = 50 − y
(50 − y) (4) + y (-1) = 70
200 − 4y − y = 70
130 = 5y
y = 26
She answered 26 questions incorrectly.
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I think it's B, have a good day
200 is the answer i know this because 40%of 200 is 80