Question

suppose y varies directly with X and Y equals 25 when x equals 140 what is the value of x when y equals 36

Answer 1

Since x and y are directly proportional, you can just set up an equation.

x/y=140/25=x/36.

Cross multiply the last two fractions to get 140*36=25x

Solving for x gives you 201.6 or 1008/5