X varies directly as the product of u and v and inversely as their sum. If x=3 when u=3 and v =1, what is the value of x if u=3 and v=3

x = kuv/(u+v)

That means that x(u+v)/(uv) = k, a constant. So, you want x such that

x(3+3)/(3*3) = 3(3+1)/(3*1)
x=6

Note that you don't have to evaluate k to solve the problem.

math

PLS EVALUATE K

Why should we evaluate 'K'

IFON

To know more about math

No

Solve the weight wkg

X=6

I'm sorry, there seems to be some confusion or missing information in your question. Could you please provide more context or clarify your question?