80 liter mixture of milk and water contains 10% milk. How much milk must be added to make water percentage in the mixture as 80%?

pick the constant one like here the constant is water so water % in 80 l mix=100-10=90% water % in final mixture =80% ----> 90% of 80= 80% of x ---->x=90 milk to be added =90-80=10l hope this helps