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20.A firefighter spraying water on a fire stood on the middle of a ladder. The smoke lessened, so she moved up 3 rungs . It got too htot, so she backed sown 5 rungs. later, she went up 7 rungs and stayed until the fire was out. then, she climbed the remaiming 4 rungs and went into the building . How amny rungs does the ladder have/

  • Math -

    from the middle to the top:


    double that

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