Question

Five editors finish a project in 3 1/2 weeks. How many editors are needed to complete the same project in 1 1/6 weeks?

Answer 1

1 1/6 is 1/3 of 3 1/2

so, to do the job in 1/3 the time, we need 3 times the editors, or 15

Or, since the amount of work is constant,

(3 1/2)(5) = (1 1/6)(x)
x = 15