GmatKiss wrote:If the function Q is defined by the formula Q = 5w/(4x(z^2)) , by what factor will Q be multiplied if w is quadrupled, x is doubled, and z is tripled?
1/9
2/9
4/9
3/9
2/27
Let w=4, x=1, and z=1.
Then Q = 5w/(4x(z^2)) = (5*4)/(4*1)(1^2) = 20/4 = 5.
W quadrupled = 4*4 = 16.
X doubled = 2*1 = 2.
Z tripled = 3*1 = 3.
New Q = 5w/(4x(z^2)) = (5*16)/(4*2)(3^2) = 10/9.
New Q/Old Q = (10/9)/5 = 2/9.
The correct answer is
B.
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