Calculate the wavelength of a wave if 80 complete waves occupy a length of 20cm

This question is just so simple. All we have to do to get the wavelength is to divide the length by the number of waves.

Wavelength = 20 cm / 80 waves

Wavelength = 0.25 cm / wave = 0.25 cm

Or if in meters, Wavelength = 2.5 x 10^-3 m