Question 256063
So how did you solve it, if not by algebra?
25x+18y=441
By graphing we see that integers are 9 for x and 12 for  y
25*9+12*18=441
225+216=441
or we can substitute x's and y's and find integers
y=(441-25x)/18
y = 49/2-(25x)/18
we also know that x is either odd or even
if even then 25x ends in 0
if odd then 25x ends in 5
so we need 18y that ends in 1 441-1 so 25x can end in 0 or 6 so 25x can end in 5
There are none that end in 1 so x must be odd

18*2=36 441-36=405 not divisible by 25
18*7=126 441-26=415 not divisible by 25
18*12=216 441-216=225 9*25=225
25q=450=18 so x can be max of 17

25*18=450
so y can be 24 max
1<x<17
1<y<24
x must be odd
y ends in 2 or 7
x=1,3,5,7,9,11,13,15,17
y=2,7,12,17,22



20z+20z=420
40z=420
4z=42
2z=21
z=10.50
So either your numbers are wrong or they sold half a pair of jeans and half a shirt.