So x and y sum means add difference means subtract so we have x+y=55 times (x-y) use distributiver property which is a(b-c)=ab-ac so distribute 55(x-y) 55(x-y)=55x-55y
so we have x+y=55x-55y add 55y to boh sides x+56y=55x subtract x from both sides 56y=54x divide both sides by 2 28y=27x to find the ratio, switch the numbers around ratio of y:x=27:28 therefor x is the greater number ratio of larger to smaler is 28:27