Posted by Sam on Tuesday, November 22, 2011 at 11:34pm.
how about making a Venn diagram using 2 intersecting circles.
Place .55 in the intersection of the two.
Prob of passing math is .7 , but you already have put .55 in the math circle, that leaves .15 to go in the non-overlapping part of math
label the non-overlapping part of chemistry as x
then
x = .55 + .15 = .95
x = .25
so prob of passing chemistry is .55 + .25 = .8
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