Let the numbers be
a and
b.
The sum of the numbers is 120, so we have: i)
a+b=120
Four times the larger divided by twice the smaller is thirty-four:
assume the larger is a :
ii)

substitute a=17b in the first equation:
a+b=120
17b+b=120
18b=120
b=120/18=60/9=20/3
thus, a=17b=17(20/3)=340/3
Answer: 20/3, 340/3