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google search
Google search results:
1: https://www.indiabix.com/aptitude/area/056001
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2: https://www.indiabix.com/aptitude/area/discussion-587
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3: http://www.isbtonline.com/mathmetics.php?id=59
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4: https://www.khanacademy.org/math/cc-fourth-grade-math/area-perimeter/imp-area-and-perimeter/v/length-and-width-from-perimeter-and-area
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5: http://academic.sun.ac.za/mathed/174WG/Problem%20solving.pdf
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6: https://www.chegg.com/xml/qandamaster369.xml
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7: https://socratic.org/algebra/linear-equations/equations-with-ratios-and-proportions
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8: https://www.mtsd.k12.nj.us/cms/lib5/NJ01000127/Centricity/Domain/534/Even%20More%20Area%20and%20Perimeter%20Word%20Problems%20KEY.pdf
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9: https://books.google.com/books?id=LOsPSCAN29gC&pg=PA2&lpg=PA2&dq=The+question+given+below+consists+of+a+question+followed+by+three+statements.+You+have+to+study+the+question+and+the+statements+and+decide+which+of+the+statement(s)+is/are+necessary+to%0Aanswer+the+question.%0AQuestion:+What+is+the+area+of+the+hall?%0AStatement+I.+Material+cost+of+flooring+per+square+meters+Rs.+2.50.%0AStatement+II.+Labour+cost+of+flooring+the+hall+is+Rs.+3500.%0AStatement+III.+Total+cost+of+flooring+the+hall+is+Rs.+14,500.%0A1.0+I+and+II+only%0A2.O+Il+and+III+only%0A3.+O+All+I,+II+and+III%0A4.+O+Any+two+of+the+three.%0A5.+O+None+of+these.&source=bl&ots=k02fkqZRUA&sig=ACfU3U19a3fIUISGedC1PfYO6Ifzx7Hakg&hl=en&sa=X&ved=2ahUKEwjbnNThiu_yAhVjmWoFHVqgBFkQ6AF6BAgQEAM
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10: http://www.opentextbookstore.com/mathinsociety/2.5/ProblemSolving.doc
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11: https://www.energy.gov/sites/prod/files/2013/10/f3/omguide_complete.pdf
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