It is unusual to do arithmetic in Roman numerals, but I x V is the same as 1 x 5 which is of course 5.
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(c/x) /v = (c/x) * (1/v) = c/(x*v), so c divided by (the product of x and v).
v + x
4 x V¯6 ---------- V¯30 Simplify V¯6 to V¯3 and V¯2; Simplify V¯30 to V¯10 and V¯3 4 x V¯3 x V¯2 ------------------- V¯10 x V¯3 Simplify V¯10 to V¯5 and V¯2 4 x V¯3 x V¯2 ---------------------- V¯5 x V¯2x V¯3 Cross out V¯3 and V¯2 from both sides. 4 ------- V¯5 Multiply the numerator and denominator by V¯5 (You cannot have a radical in the denominator). 4 x V¯5 --------- <---- Final Answer 5
There is no "you" in P = V x I
x = W2 - V and you cannot get any further than that since neither W nor V are known.