Answer:
W is multiplied by 8. Option(d)
Step-by-step explanation:
Given that,
W varies jointly with x, y and z.
It means W is directly proportional to xyz
So,
W ∝ xyz
W = kxyz
where 'k' is constant
Now double the x, y & z
W' = k(2x)(2y)(2z)
W' = k (2*2*2)(xyz)
W' = 8kxyz
W' = 8(W) ∵W = kxyz
So, W is multiply by 8 when x, y, z are double.
That's the final answer.
