exam Maths Puzzle Numerical Ability

Can you please help me solve this problem?

3x - 2(5 - x) = -3(x - 10) + 3x

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exam Other Question

I need help please. if x=yz,find the value for x given that y=2 and z=5. Find the probability of selecting a green marble from a jar that contains four blue marbles, three red marbles, and five green marbles.