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n/A = fn/fA
27/40=fn/440
fn=27/40 * 440
fn=27 * 440/40
fn=27 * 11
fn=D=297 Hz
2. E:A=30:40
n/A=fn/fA
30/40 = fn/440
fn=30/40 * 440
fn=30 * 440/40
fn=30 * 11
fn=E= 330 Hz