According to the Height to Weight ratio for children, the average for a 12-13 year old girl at 58 to 62 inches tall should weigh 85 to 100 lbs. You are at 56 inches (4'8) which is 2 inches shorter, so your 81 lbs is about right, on the low side of the scale. So, you are growing normaly, so far!
No, they should weigh the same.
uh..........8 pounds?
They both weigh a pound. Which means the weigh the same
One pound; 16 ounces; 448 grams
A pound.
they both weigh the same because a pound of sand and a pound of lead will still weigh a pound
They weigh the same
33 - 45 pounds.
A healthy, well bred hedgehog should weigh 13oz to a pound, maybe more.
They both weigh the same as both of them originally weigh-in at a pound
A scale can weigh either one, and it can also weigh a pound of feathers.
The value is determined by weight. Copper is currently about $3.75/pound, so weigh your copper and do the math.