Question

A crane has a cable with a breaking strain of 6400kg measured to 2 significant figures.
|t is used to lift crates which weigh 90kg measured to the nearest 10kg.
What is the greatest number of crates that can be safely lifted at one time without breaking the cable?
Some working must be shown.

Answer 1

Answer:

66 crates

Step-by-step explanation:

100/2=50

lower bound of 6400kg = 6350kg

10/2=5  

upper bound of 90kg = 95kg

6350kg/95kg=66kg