7th Grade Math

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Andy was on his way to a marble tournament when he met Bob. Andy's bag of marbles was heavy, so he gave Bob 1/2 of his marbles plus 2. Then he met Alex and gave him 1/4 of this remaining marbles plus 5. Just before arriving at the tournament he met Emily and have her 1/2 of the marbles he had left. When he got to to tournament he had 2 marbles. How many did he start with?

  • 7th Grade Math -

    I believe 21
    2 doubled is 4
    4 + 5 is 9
    a quarter of 9 is 3
    3+9 is 12
    12 plus two is fourteen and half of fourteen is 7
    7 plus 14 is 21.

  • 7th Grade Math -

    Andy has X-Marbles.
    Gave Bob (X/2 + 2),
    Bal. = X - (X/2 + 2) = X/2 - 2.

    Gave Alex 1/4(X/2 - 2) + 5 = X/8 + 9/2,
    Bal.=(X/2 - 2) - (X/8 + 9/2)=3X/8-13/2.

    Gave Emily 1/2(3X/8 - 13/2) =
    3X/16 -13/4.

    Bal. = 3X/16 - 13/4.

    3X/16 - 13/4 = 2,
    Multiply both sides by 16:
    3X - 52 = 32,
    3X = 32 + 52,
    3X = 84,

    X = 84 / 3 = 28 Marbles.

  • 7th Grade Math -

    2 1/2 =2 2/4
    5 1/4
    1/2 2/4
    ________________

    8 1/4

  • 7th Grade Math -

    I Think it is 21 Because:
    2 doubled is 4
    4 + 5 is 9
    a quarter of 9 is 3
    3+9 is 12
    12 plus two is 14 and 1/2 of 14 is 7
    7 + 14 is 21.
    so 21 is the answer

  • 7th Grade Math -

    14÷2=7 7 +14=21 21×2=42 42×2=84 Answer:84 this isn't hard I'm 6 grade

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