Verified answer

Let:

k = constant variable

Solution:

x = kyz

60 = k(2)(2)

60 = 4k

4k/4 = 60/4

k = 15

x

x = kyz ; z = ---

ky

x

z = ----

ky

180

= --------

(15)(3)

= 180/45

z = 4

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