exam Maths Puzzle Numerical Ability

Solve by addition
x+y=7
x-Y=9

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exam Other Question

Can someone please help me out with this equation please?
A dr office mixed a 75% disinfectant solution with a 25% disinfectant solution. How many liters of each were used to make 20L of a 40% disinfectant solution. Thanks the crowd that heard the President speak was estimated to be 10000 people.The actual crowd could be 750 people more or less than this. what are the possible values for the actual crowd size?