If r=5z then 15z=3y, then r=?

from the second

15z=3y
5z = y
but r = 5z
so r = y

To find the value of r, we need to use the information given in the equations.

We are told that r = 5z and 15z = 3y.

First, let's solve the second equation for z:

15z = 3y

Dividing both sides of the equation by 15, we get:

z = 3y/15

Simplifying the right side further, we have:

z = y/5

Now that we know the value of z, we can substitute it into the first equation:

r = 5z

Substituting z = y/5, we get:

r = 5(y/5)

The '5' in the numerator and denominator cancel out, leaving us with:

r = y

Therefore, the value of r is y.