more than a first-grader
50
90 to 110 pounds
'bout 58 pounds to 72 pounds
weighs as much as a fifth grader
No, but it really depends on the height. For the average third grader 90 pounds would be way too much, but if you are extremely tall then perhaps 90 pounds is just right for you.
120
50
0.5stone
between 50 and 150 :)
1kg
About 80 TO 110
10000000 pounds
50 to 70 pounds