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<p>Shouldn’t that look quite familiar?</p>
<p>Interesting how (x^2+2x)/(2x+2) is nothing else than x * (x+2) / x + (x+2) :)</p>
<p>Yup that’s right</p>
<p>how about this question?</p>
<p>ratio of male to female is 2 to 3
if the number of males is increased by 400 then the ratio is 1 to 1.
how many people are there total now?</p>
<p>also
there are 6 cards with a different integer 0 through 5.
if two cards are selected at random without replacement, what is the probability that their sum will be 3?</p>