What volume of 0.2 M NaOH (in ml) solution should be mixed to 500 ml of...

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What volume of 0.2 M NaOH (in ml) solution should be mixed to 500 ml of 0.5 M NaOH solution so that 300 ml of final solution is completely neutralised by 20 ml of 2 M H₂PO4 solution. [Assuming 100% dissociation] What volume of 0.2 M NaOH (in ml) solution should be mixed to 500 ml of 0.5 M NaOH solution so that 300 ml of final solution is completely neutralised by 20 ml of 2 M H₂PO4 solution. [Assuming 100% dissociation]