The score on a trivia game is obtained by subtracting the number of incorrect answer from twice the number of correct answer. If a player an

Question

The score on a trivia game is obtained by subtracting the number of incorrect answer from twice the number of correct answer. If a player answered 50 total question and obtained a score of 40 , how many questions did the player answer correctly?

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Alaia 3 weeks 2021-12-30T21:28:31+00:00 1 Answer 0 views 0

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    2021-12-30T21:30:13+00:00

    Answer:

    The player answer correctly 30 questions

    Step-by-step explanation:

    First we have to develop the information that gives us as 2 equations

    x = correct answer

    y = incorrect answer

    z = score = 40

    h = total answer = 50

    2x – y = z               x + y = h

    2x – y = 40             x + y = 50

    we clear the x of one equation and replace the value of x in the other equation

    x = 50 – y

    2x – y = 40

    2(50 – y) – y = 40

    100 – 2y – y = 40

    -3y = 40 -100

    y = -60/-3

    y = 20

    x = 50 – y

    x = 50 – 20

    x = 30

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45:7+7-4:2-5:5*4+35:2 =? ( )