The total amount of water is 1/4 liter. When we pour this into 5 glasses equally, we get
[tex] \frac{1}{4} \div 5 = \frac{1}{4} \div \frac{5}{1} = \frac{1}{4} \times \frac{1}{5} = \frac{1}{20} [/tex]
So in every glass we have 1/20 liter.
1 / 20 l = 0.05 l = 50 ml
Hence, in every glass we have 50 milliliters.