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OpenStudy (anonymous):
Someone help me please!! A maths test has two problems. The first was solved by 70% of the students. The second was solved by 60%. Every student solved at least one of the problems. Nine students solved both problems. How many students took the test?
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OpenStudy (javk):
so first you need to figure out what percentage got both right
OpenStudy (paxpolaris):
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OpenStudy (paxpolaris):
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OpenStudy (paxpolaris):
9 students is 30%
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