What Age Is My Brain?

Math: There are 49 runners signed up for a race. There are 36 more slow runners than fast runners. How many slow runners have signed up to compete?

92%

Correct!

Incorrect!

Let fast = f and slow = f+36. Then f+(f+36)=49 → 2f+36=49 → 2f=13 → f=6.5, so slow=42.5, not a whole person. The numbers are inconsistent; the given answer of 7 slow runners is incorrect.

Math: There are 49 runners signed up for a race. There are 36 more slow runners than fast runners. How many slow runners have signed up to compete?

92%