Question

You can ride your bike around your block twice and the whole neighborhood once in 10 minutes. You can ride your bike around your block twice and the whole neighborhood 4 times in 31 minutes. How long does it take you to ride around the neighborhood?

Answer 1

both times include two blocks, so the only difference is the neighborhood laps.
3n = 31-10

Answer 2

You have to solve it

Answer 3

The answer is 7