exam Maths Puzzle Numerical Ability

Find the probability of selecting a green marble from a jar that contains four blue marbles, three red marbles, and five green marbles.

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Can you please help me solve this problem?

3x - 2(5 - x) = -3(x - 10) + 3x Two towns are 80 km. apart. Sylvia wants to drive from one town to the other in exactly one hour. The first 30 minutes she drives at a rate of 60 km/hr. At what constant rate must she drive for the next thirty minutes to accomplish her goal?