Question

12a=10b iar 30c=28b si a+b+c=1672:)))) va rog e urgentttt

Answer 1

12a=10b / : 2 , 6a=5b , deci a= 5b/6
30c=28b/: 2 , 15c=14b , deci c= 14b/15
Inlocuim in suma: 
5b/6 + b + 14b/15 = 1672 , numitorul comun e 30 
25b/30 + 30b/30 + 28b/30 = 1672 / * 30
83b=1672*30 , deci b =604,3 
a=5b/6=503,5
c= 14b/15=564, 01