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This depends on your BMI ( Body Mass Index)

Take your weight in kilograms and divide them by length x length in centimeter

For example: your weight is 50 kilograms and you are 160 centimeters tall.

You BMI is 50/160=0.3125 ans/160=0.00195

Your BMI would be 19.5, which is perfect

A BMI for a 13 year old is good when its between 17.5 and about 24.

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16y ago

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