A boy is twice as tall as his little sister and he is 30 cm shorter than his father. The
2 answers:
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Can't be done without knowing what 
is...
But I can tell you that the average value of is given by
At the very least, we can compute the denominator, which is just the area of
. You have
so the average value will be
But I can tell you that the average value of
At the very least, we can compute the denominator, which is just the area of
so the average value will be