Your answer is 60.

Fractions indicate division, so in this problem we're dividing 10 into r to get six. We use inverse operations to get the solution to r.
The inverse of division is multiplication.
So we multiply 10 by 10 and 6 by 10.
Multiplying 10 by 10 cancels out the ten, leaving us with x. We do this to get x alone on the left side so our equation looks like this:

So what's 6 multiplied by 10?

So,

I hope you found this helpful!