How are rational numbers written as a decimal

i think it because when you rational X and witten the numer as a decimal hope i right just joke

example is rational number 4 12 then it say add and decimal the answer going to be 4.12

water molecules will move from the side of higher water concentration to the side of lower concentration until both solutions are isotonic. at this point, equilibrium is reached. in an isotonic solution, the flow of water in and out of the cell is happening at the same rate.

hope this < 3