exam Maths Puzzle Numerical Ability

x+6y=10
x-y=10

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In the cafeteria of Karachi University 40% drink Coca-cola,50% drink pepsi-cola and 25% drink both. If a person is selected ,find the probability he/she drinks either coca-cola or pepsi-cola. -2y(2y-3)-(5y=1)(y-3)