Answer:
25
Step-by-step explanation:
Since y varies inversely with x, the relation between y and x will be:

Introducing the proportionality constant, we can write:

Using the first set of given values of x and y, we get:

This means, the relation between y and x is:

We have to find y if x = 20. Using this value in above equation, we get:

Thus y would be 25 if x is 20.
C cubed minus the product of five and Q +4
=
C^3 - [5(Q +4)]