For this problem we have the following info given:
Cups of coffee= 25 Glasses of orange juice= 10 Omelets= 6
We want to estimate how many glasses of orange juice does the restaurant expect to sell in 1 hour.
We know that the restaurant sell 10 glasses of orange juice every 15 min and we can create the following proportional rule since we know that in 1 hour we have 60 minutes.
Where x represent the number of glasses of orange juice in 60 minutes=1 hour. And if we solve for x we got:
And we can conclude that the restaurant expect 40 glasses of orange juice every 1hour=60 minutes.