exam Maths Puzzle Numerical Ability

A bag has yellow marbles and brown marbles. Half of the brown marbles are made of plastic. A marble is selected at random from the bag. What is the probability that it is a brown, plastic marble?

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I need help solving this question


-2=10b- 3
Please help to graph the following :

4x < -12

2x + y > or equal to -4

thank you