An English instructor asserted that students' test grades are directly proportional to the amount of time spent studying. Lisa studies 6 hr for a particular test and gets a score of 77. At this rate, how many hours would she have had to study to get a score of 97?

Since an English instructor has asserted that the relation between studies and test grades is proportional then we can find the time by unitary method.

∵ To score 77 Lisa has to study for 6 hours.

∴ To score 1 Lisa has to study for = [tex]\frac{6}{77}[/tex]

∴ For a score of 97 Lisa has to study = [tex]\frac{6}{77}(97)[/tex]

= 7.55 hours

So Lisa has to study 7.55 hours to score 97 in the test.

An English instructor asserted that​ students' test grades are directly proportional to the amount of time spent studying. Lisa studies 6 hr for a particular test and gets a score of 77. At this​ rate, how many hours would she have had to study to get a score of 97​?

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An English instructor asserted that students' test grades are directly proportional to the amount of time spent studying. Lisa studies 6 hr for a particular test and gets a score of 77. At this rate, how many hours would she have had to study to get a score of 97?