Help with frequency of oscillation equation please

[Stephanopolous]

Solving the equation given in the passage for g yields g = 4π2f 2L. Since n is the number of cycles per minute, the frequency f (in cycles per second) is given by the equation f = n / 60. Substituting n / 60 for f in the equation for g yields g = 4π2(n / 60)2L = π2n2L / 900.

I’m not understanding how they moved from 4pi^2(n/60)^2L to pi^2n^2L/900??

Thank you in advance

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[Stephanopolous]

never mind they just reduced it down, sometimes I swear my brain is frying from too much studying