Simran devotes  7hours to her studies …

Total hours devoted for study = 7 hours

Hours devoted to study math = {tex}2{4\over 5}= {14\over 5}hours{/tex}

Hours devoted to study  English= {tex}1{1\over 4}= {5\over 4}hours{/tex}

Hours devoted to study math and english = {tex}{14\over 5} +{5\over 4}={ 56+25\over 20}={81\over 20}{/tex}

hours devoted to study other subjects= total hours - hours devoted to study math and english = {tex}7-{81\over 20}= {59\over 20}=2{19\over 20} hours{/tex}

Total hours devoted = 7 hours

Hours devoted for math = {tex}2{4\over 5}= {14\over 5}hours{/tex}

Hours devoted for English= {tex}1{1\over 4}= {5\over 4}hour{/tex}

Hours devoted for both English and math = {tex}{14\over 5} +{5\over 4}={ 56+25\over 20}={81\over 20}{/tex}

hours devoted to other subjects = remaining hours = {tex}7-{81\over 20}= {59\over 20}=2{19\over 20} hours{/tex}