book Maths Puzzle Numerical Ability

The rate r at which a disease spreads in a population of size P is jointly proportional to the number x of infected people and the number P-X who are not infected. An infection er

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book Other Question

Determine the Richter scale measure (two decimal places) of an earthquake having an intensity of I=101,620,000Io I am having trouble with a question, Add the fractions

q
--------
q^2+5q+6

and

1
--------
q^2+3q+2

I think the answer is

q^2+2q+3
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