Let's go through each sentence to understand the problem.

First, we have that a number x is 8 times another number y. Put in an equation, we get :

x = 8*y (1)

Next, we are asked to determine the percentage that y is less than x. Basically that means to find by how much y is less than x.

So, starting from (1) we get :

y = (\frac{1}{8})*x = 0,125*x If x represents 100% then that means :

x - y = x - (\frac{1}{8})*x = x - 0,125*x = x*(1-0,125) = x*0,875Thus, y is 87,5% less than x. Meaning that the answer is B.

Hope that helped.