exam Maths Puzzle Numerical Ability

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experiments and probabilities

2. Explain what outcomes of an experiment are. What does it mean to have equally likely outcomes? Provide ex-amples to illustrate

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5x+8+3x-x+5=6x-3


Please explain.
Allen bought 20 stamps at the post office in 37 cents and 20 cents denominations. If the total cost of the stamps was $7.06, how many 37 cent stamps did Allen buy?