class, there were 203 students who enrolled in 2nd year. Some had analytic Geometry subject, some had Solid Mensuration and some had both. If 78 enrolled in Analytic Geometry and 18 who are enrolled in both subject, how many of them enrolled in Solid Mensuration?

Algebra for College Students
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Author:Jerome E. Kaufmann, Karen L. Schwitters
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Chapter12: Algebra Of Matrices
Section12.CM: Cumulative Review Problem Set
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In a mathematics class, there were 203 students who enrolled in 2nd year. Some had analytic Geometry subject, some had Solid Mensuration and some had both. If 78 enrolled in Analytic Geometry and 18 who are enrolled in both subject, how many of them enrolled in Solid Mensuration?

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