Unless you're on medication which has weight gain as a side effect, or similar, I really can't see it being possible to do this.
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A day is one seventh of a week.
One stone is equal to 14 pounds. Therefore the weight is 16 and 1/3 stone.
90 to feed a family of 3 for a week => 30 to feed one for a week => 30*5 to feed a family of 5 for a week ie 150. However, this assumes that it costs the same to feed adults and children in a family (unlikely), and that there are no economies of scale (also unlikely).
Well, if Plant B was 19 centimeters tall in Week 3, and we're talking about how much it grew in Week 3, then it didn't grow at all in Week 3. It stayed the same height, honey. No growth spurt for Plant B that week.
1 yard of stone dust is 3' x 3' x 3' or 27cu'