PLEASE HELP WITH THIS MATH SUM
2 answers:
How many questions did David answer correctly? David answered 48 questions correctly. We’ll call the number of correct answers a, incorrect answers b. 60 questions on the test gives us: a + b = 60 And the scoring gives us: 4a - 7b = 108 First we’ll solve for a in terms of b: a = 60 - b The we’ll substitute that value for a in the second equation to get a numerical value for b: 4(60 - b) - 7b = 108 240 - 4b - 7b = 108 -11b = -132 b = 12 Now we go back to the first equation and get a numerical value for a: a = 60 -b a = 60 - 12 a = 48 Check the math with the scoring equation: 4(48) - 7(12) = 192 - 84 = 108 Please lmk if you have any questions.
Answer:
27 questions correct
Step-by-step explanation:
Well 108 marks and 4 marks for each correct,techinally you can’t subtract since 108 is the final score, and the thing was already subtracted so \divide.
108/4= 27
27 correct answers
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