[shannenn]

4 kitchen assistants can prepare 10 kg of vegatables in 45 minutes. How long would it take 15 assistants to prepare the same amount?

[Unknown008]

Seeing it at first, you might think about using simple proportions, but logic tells you that they should complete it in a lower period.

This is a problem which requires inverse proportions.

It is mainly in the form

where y is the time and x is the number of assistants.

Using the first piece of information, you can obtain the value of the constant k.

Then, you use that constant k with the new asked number of assistants and solve for x, the time that they take. What do you get? :)