Each juice bottle serves 10 people. Why does Emma need 4 bottles of juice to serve 35 drinks?
1 juice bottle = 10 people
So, it'll be like this:
1 juice bottle = 10 people
1 juice bottle + 1 juice bottle = 10 people + 10 people
2 juice bottles = 20 people
2 juice bottles + 1 juice bottle = 20 people + 10 people
3 juice bottles = 30 people
We need to serve 35 drinks, right? If we're just going to order or get 3 juice bottles, there are only 30 people who'll get their drinks. Thus, 5 people will not get their own drinks.
3 juice bottles = 30 people
3 juice bottles + 1 juice bottle = 30 people + 10 people
4 juice bottles = 40 people
If we're going to get 4 juice bottles, there are 40 people who'll get their drink. We need 35 drinks so if we're going to get 4 juice bottles, then all people would get a drink (40 drinks) but there are 5 extra. We wouldn't mind on the extra because the important thing about this is all of the people owning or getting their own drink.
So yeah.
