Question

divide 54 into two parts such that one part is 2/7 of the other.

Answer 1

x+y= 54....eq 1
and x+( 2/7)x=y .... eq 2
from eq 1. . x= 54 -y
put it into eq 2

Answer 2

let one part be x
so second part is (2/7 )x

now x + (2/7 )x = 54

 7x +2x = 378
9x = 378

x = 42

so first part = 42
and second part = 2/7 * 42 = 12