exam Maths Puzzle Numerical Ability

n-5 1 n-3
---- = --- - ----
6n-6 9 4n-4

I tried to my best to type the fractions so I hope this makes sense. Can you help me solve this?

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exam Other Question

write the scientific notion
1. 360,000,000,000
2. 0.00000000087 27. How much of an alloy that is 20% copper should be mixed with 200ounces of an alloy that is 50% copper in order to get an alloy of 30% copper?