Answer:

54

Step-by-step explanation:

JOINT VARIATION

• a = kbc, where k = a/bc

x = 18

w = 2

y = 6

z = 5

Solve for k:

k = x/wyz

k = 18/(2)(6)(5)

k = 18/60; simplify —> 3/10

Solve for x

x = kwyz

x = (3/10)(5)(12)(3)

x = (15/10)(12)(3)

x = (180/10)(3)

x = 540/10

x = 54