Question 694200
let them be Mr. A & Mr B

Mr. A wages = x
Mr. B wages =y

x/y = 9/7
x=(9y/7)

x-y =200
substitute x

(9y/7)-y=200

multiply equation by 7
9y-7y=7*200

2y=1400
/2
y=700

So x = 900

Their wages are 900 & 700