Question

A piece of wood is of length 45cm.
The length is divided in the ratio 7:2
Work out the length of each part.

Answer 1

let there ration is x

such as

7x : 2x  =  7 : 2

so 

7x + 2x =45

9x =45
x=5

then length of each part is
7*5  = 35
and 
2*5  = 10

length of each part is 35 and 10

Answer 2

Here is ur answer....hope it helps u