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     EduGorilla 
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    A balloon can go up in the air at the rate of 24 kmph and its speed diminishes by a quantity, which varies as the square root of the number of stones attached to it. With four stones, its speed is 20 kmph. The highest number of stones with which the balloon can go up in the air is

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    1. 143
    2. 144
    3. 145
    4. 142
    5. 140
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