Solve the following equations with floor and ceil using Wolfram|Alpha?

Questions
,
1

When I enter this:

n=50, B=150, k=29.5, h=13.5, x=floor(B/k), H=(ceil(n/(2*x))*h)

I get a solution:

B = 150, h = 27/2, H = 135/2, k = 59/2, n = 50, x = 5

BUT when I enter this:

n=50, B=150, R=2, k=29.5, h=13.5, x=floor(B/k), H=(ceil(n/(R*x))*h)

I get an error:

Wolfram|Alpha doesn’t understand your query

Why?