It depends on how long there arms are I think
Is there a picture we can see ?
Answer:
490 students have back packs
Step-by-step explanation:
700 / 10 = 70
70* 7 = 490
The equation for percent error is:

60 lb is the experimental and 68 lb is the accepted.
Plug in you values...

≈ 11.76 %
Sry but that’s too much which one would you like help on