exam Maths Puzzle Numerical Ability

divide

2x-6
over
21
divided by
5x-15
over
12

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exam Other Question

Find the slope of the line passing through the points (4,0) and (4,5)

Please help to understand this problem

Thank You You have 20 grams of phosphorus-32 that decays 5% per day. How long will it take for half of the original amount to decay?