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24 August, 19:06

Mary Lou has 2 more nickels than pennies, and she has 30 coins all together. Use x for the number of pennies.

a) 2 (x + 2) = 30

b) x + (x + 2) = 30

c) 2x + 30 = 5

d) x + 2 = 30

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Answers (1)
  1. 24 August, 22:33
    0
    Let y be the number of nickels

    x+y=30 ... (1)

    y-2=x ... (2)

    From (2) y-2=x

    y=x+2 ... (3)

    Sub (3) into (1)

    x + (x+2) = 30

    Thats why the ans is B
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