Question

Un biciclist a parcurs un drum astfel : prima zi 1/4 din drum , a doua zi 5/6 din din rest ramanandu-i de parcurs 28 km . Cati kilometri are intregul drum ! dau coroana urgent , dar si explicata

Answer 1

a•1/4+(a-a•1/4)5/6+28km=a <=> a-a•14-(a-a•1/4)5/6=28km <=> (a-a•14)(1-5/6)=28 km <=> (a-a•1/4)(6/6-5/6)=28km <=> (a-a•1/4)•1/6=28km <=> a-a•1/4=28•6/1=168km <=>. a(1-1/4)=168km <=> a(4/4-1/4)=168km. <=>.a•3/4=168km => a=168•4/3=56•4=224