Question Number 10076 by konen last updated on 23/Jan/17

3a=4b=5c 2a+3b−c=146 ⇒c=?

Answered by ridwan balatif last updated on 23/Jan/17

3a=5c→a=(5/3)c 4b=5c→b=(5/4)c 2a+3b−c=146 2((5/3)c)+3((5/4)c)−c=146 ((73)/(12))c=146 c=2

Answered by ridwan balatif last updated on 23/Jan/17

another way 2a+3b−c=146 −−−−−−−−−×12 24a+36b−12c=146×12 8(3a+4b)+4b−12c=146×12 8(5c+5c)+5c−12c=146×12 73c=146×12 c=24

Commented bykonen last updated on 23/Jan/17

thank you♥