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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

User Palak
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z=kx now we put the value then 55=5x
55/5=k
11=k
z=kx
when x is 12
then z=12*11
=132
User Manish Malviya
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