The weight seems like most accurate to me, even thought you didn't show me what type of measurement he took.
Answer:
61.54%
Step-by-step explanation:
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Answer:

Step-by-step explanation:
Given
y jointly varies to x and z^2
Required
Find the equation
We start by writing out the variation;

Write as equation

Substitute values of x,y and z



Divide both sides by 7




Substitute k in 

Insightful learning
Also how does this drop down in mathematics?
60% is her score as a percentage