SOLUTION: If 7 x's = 2 y's and 3 y's =5 z's then 21 x's = ___z's

Algebra ->  Proportions  -> Lessons -> SOLUTION: If 7 x's = 2 y's and 3 y's =5 z's then 21 x's = ___z's       Log On


   

Question 159250: If 7 x's = 2 y's and 3 y's =5 z's then 21 x's = ___z's
Answer by t_as87(5) About Me  (Show Source):
You can put this solution on YOUR website!
If 7 x = 2 y (multiply both sides by 3)
you get 21 x = 6 y
and since 3 y = 5 z (multiply both sides by 2)
you get 6 y = 10 z
SO
21 x = 10 z!