$\"\"$

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Using a proportion that relates the values.

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$\"\"$ (Apply Joint variation)

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Substitute $\"\"$ .

\

$\"\"$

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$\"\"$ (Apply Cross multiplication)

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$\"\"$

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$\"\"$ (Divide each side by 40)

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$\"\"$

\

Therefore, the value of y is 64. $\"\"$

\

The value of y is 64.