math
posted by nisha .
The ratio of zinc and copper in an alloy is seven ratio nine if weight of copper in the alloy is eleven point kg then find the weight of zinc in the alloy

7/9 = z/11
Cross multiply to solve for z. 
Copper=c
Zinc=z
APQ (As Per Question)
C:Z=9:7
11.7/Z=9/7
Z=9*10/117*9
Z=9.1kg