exam Maths Puzzle Numerical Ability

Does anyone know:

Is 12 a solution to the equation 19 - x = 7?

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exam Other Question

For a function of the form y=a(b)^x to produce a decay curve, what must be true about b? (Assume a is greater than 0): (a)b is less than 0 (b) b is greater than 0 (c) 0 is less than b is less than 1 (d) b is greater than 1. plzzzzzzzzzz help me
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.