exam
Maths Puzzle
Numerical Ability
9/x^2-9x+14 - 7/x-2
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exam Other Question
Phosphorous-32 is used to mark cells in biological experiments. If phosphorous-32 has a continuous daily decay rate of 4.85%, what is the half-life?
One number is 3 times another number.The sum of their reciprocals is 4/9.What are the numbers?I got 4 and 12.That was wrong.The other choices are 1 and 2,2 and 6, and 3 and 9.Can somebody help me?