a small amount of solute is dissolved in a larger amount of solvent. It would not make sense to have more solute than solvent. You can think of it like this, you can dissolve a teaspoon of salt in a liter of water but you can't dissolve a kg of salt in a teaspoon of water.
also, the solute is what is being dissolved and the solvent is what is dissolving the solute so the ones they the solvent is dissolved in the solute does not make complete sense.
