Question

Solve any two of the following. 

If a : b = 7 : 2, find the ratios  (i)` b : a`  (ii) `(a+b)/b` 

 

Answer 1

(1)` a:b=7:2` 

`∴ b:a=2:7...............`invertendo 

(2) `a/b=7/2  ∴ (a+b)/b=(7+2)/2=9/2............................ "Componendo"`