Question

wx/xy = 5/7 and xy/yz = 7/9 if YZ = 18 how long is WZ?

Answer 1

since YZ = 18

XY/YZ = 7/9
substitute 18 to YZ
XY/18 = 7/9
then multiply
XY = (18) (7/9)
XY = 14
then solve
WX/XY = 5/7
substitute 14 to XY
WX/14 = 5/7
WX = (14) (5/7)
WX = 10
summarize the value
WX = 10, XY = 14, YZ = 18
How long is WZ?
10 + 14 + 18 = 42
WZ = 42