Amanda ran 4 laps around the school track. Clifford ran half as many laps an Brian ran. together, the 3 friends ran 13 laps. How many laps did Brian run?

Answer 1

Build equations using the given information:

13 = A + B + C

A = 4

C = B/2

Plug in the value for A and substitute B/2 for C in the first equation, solve for C:

13 = 4 + B + B/2

9 = (3/2)B

6 = B

Brian ran 6 laps