If 100 runners went with 4 bicyclists and 5 walkers, how many bicyclists would go with 20 runners an

[math_celebrity]

If 100 runners went with 4 bicyclists and 5 walkers, how many bicyclists would go with 20 runners and 2 walkers?

Set up a joint variation equation, for the 100 runners, 4 bicyclists, and 5 walkers:
100 = 4 * 5 * k
100 = 20k

Divide each side by 20
k = 5 <-- Coefficient of Variation

Now, take scenario 2 to determine the bicyclists with 20 runners and 2 walkers
20 = 2 * 5 * b
20 = 10b

Divide each side by 10
b = 2