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y ∝ 1/(x)1/3

y = k/(x)1/3

x = k3 / y3

Now when y increase by 10%, y1 = 1.1y

x1 = k3 / (1.1y)3 

x- x1 = k3 / y3 – k3 / (1.1y)3 = k3 / y3 ( 1- 1/(1.1)3 ) = (0.2487)k3 / y3 

Decrease in percentage in x = (x- x1 )/x * 100% = 24.87%

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