https://postimg.org/image/bqlyksxy9/
https://postimg.org/image/r45l1lok3/

I understand what a conversion factor is and how to convert a quantity using a conversion factor, but in these two problems, I'm not understanding a few things.

1. Why do we need two conversion factors? Why can't we use one? Why is this necessary?

2. I don't understand how the bottom equations led to their answers. I don't know how we ended up with 15kg apples and 28,800s based off of the equations. Can you explain?

3. I don't understand how they turned 28,000 into scientific notation. Can you explain?

Question

https://postimg.org/image/bqlyksxy9/
https://postimg.org/image/r45l1lok3/

I understand what a conversion factor is and how to convert a quantity using a conversion factor, but in these two problems, I'm not understanding a few things. 

1. Why do we need two conversion factors? Why can't we use one? Why is this necessary?

2. I don't understand how the bottom equations led to their answers. I don't know how we ended up with 15kg apples and 28,800s based off of the equations. Can you explain?

3. I don't understand how they turned 28,000 into scientific notation. Can you explain?

kikuo · Answer

@IMStuck