Question

Carl ran around the track 3 more times than Daria and 2 fewer times than Erin. When they were done they added up the number of laps that all ran. How many laps did they run in total in terms of the number of laps that Daria ran?

Answer 1

Total laps = 10d

Explanation:

Let c = Carl's laps

d = Daria's laps

e = Erin's laps

c = 3d

c = e/2

c + d + e = totals laps

We can insert 3d in place of c in the third equation

3d + d + e = total laps

Also, e/2 equals 3d

e/2 = 3d

Multiply both sides by 2

(e/2 = 3d)2

e = 6d

Insert the new e

3d + d + 6d = 10d = totals laps