SOLUTION: If y varies jointly as x and z, and y = 12 when x = 9 and z = 3, find z when y = 6 and x = 15.

Question 799574: If y varies jointly as x and z, and y = 12 when x = 9 and z = 3, find z when y = 6 and x = 15.
Answer by stanbon(75887) (Show Source): You can put this solution on YOUR website!
If y varies jointly as x and z
y = k*x*z
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Solve for "k" using "y = 12 when x = 9 and z = 3"
12 = k*9*3
k = 12/27 = 4/9
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Equation:
y = (4/9)*x*z
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Find z when y = 6 and x = 15.
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6 = (4/9)*15*z
----
6 = (20/3)z
Ans: z = 18/20 = 9/10
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Cheers,
Stan H.
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