book Maths Puzzle Numerical Ability

Name the properties used in each step.
1. =3C+5C+5(2)

2. =(3C+5C)+5(2)

3. =(3+5)C+5(2)

4. =8C+10

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How much of an alloy which contains 6 grams of gold in 10 grams must be melted with another alloy which conta Can someone please show me how to do this:
(s+3)(s-3)