The topic: Daltons Law Of Partial Pressure has many formulas which are inter-related... I am very confused.. Please help me out with these topics...

In chemistry and physics, Dalton's law (also called Dalton's law of partial pressures) states that the total pressure exerted by the mixture of non-reactive gases is equal to the sum of the partial pressures of individual gases.
Simply apply these formula to calculate the partial pressure of individual gas and mole fraction of any gas