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19-07-2017
Mathematics

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The variable Z is directly proportional to X. When X is 5, Z has the value 55.

What is the value of Z when X = 12

Respuesta :

19-07-2017

z = k * x
55 = k * 5
divide both sides by 5
11 = x

z = 11x

z = 11 * 12
z = 132

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