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In one school, 156 students passed geography or history. There were 75 students who passed in both subjects. If 9 more passed geography than history, find how many took each subject not enough information to find "how many took each subject"
...can find how many passed each topic
... but no information on the number of failures ... taken = passed + failed
75 passed both...so (156 - 75) passed either
... 9 G more than H ... G or H is 81 students
G = H + 9 ... 2 H + 9 = 81 ... solve for H, substitute to find G
don't forget to add the 75 who passed the two Erics
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