Algebra Age Problems Examples Bob′sageistwicethatofBarry′s.Fiveyearsago,BobwasthreetimesolderthanBarry.Findtheageofboth. MrJohnis7timesasoldashisgrandson.In3yearstime,thesumoftheirageswillbe102.HowoldisMrJohnnow? DanistwiceasoldasBob.Thesumoftheiragessevenyearsagowas13.Howoldaretheynow?
Computer algebra systems coming of age: dynamic simulation and optimization of DAE systems. Math. Comput. Chem. Eng. 62, 125-138. ISSN 00981354. http://dx.doi.org/10.1016/j.compchemeng.2013.11. 004 〈http://linkinghub.elsevier.com/retrieve/pii/S0098135413003542〉.Navarro, A.; Vassili...