Question 309115
Suppose that y  varies jointly with w and x and inversely with z.
y = k(wx/z)
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Solve for "k" using  y = 360 when w = 8, x = 25 and z  = 5.
360 = k(8*25/5)
360 = k(40)
k = 9 
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Write the equation that models the relationship.
y = 9(wx/z) 
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Then find y  when w = 4, x = 4 and z = 3.
y = 9(4*4/3)  
y = 3*16
y = 48
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Cheers,
Stan H.
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a. {{{ y= (9wx)/z }}} ; 48
b. {{{ y= (5z)/wx }}} ; 15
c. {{{ y= (5wx)/z }}} ; 80/30
d. {{{ y= (9z)/wx}}} ; 27/16