Does anyone know how to do this ?

What is the value of the expression 9+n/3-6 when n = 12? 1. 5. 7. 12.

The measure of angle 0 is 600 degrees

You can ride your bike around your block 6 times and the whole neighborhood 5 times in 16 minutes. you can ride your bike around your block 3 times and the whole neighborhood 10 times in 23 minutes. how long does it take you to ride around the neighborhood?