21/35 in simplest form is 3/5 because you need to find the GCF first, then divide by it. the greatest common factor in this case is 7, so you need to divide 21 and 35 by seven.
So, The ratio of Ryan to Charlie is 1:5 Ryan=x Charlie=5x 5x+x=1608 6x=1608 Divide both sides by 6 1608/6=268 x=268 Ryan has 268 stamps. Charlie has 5(268) 1340 stamps. 1340+268=1608 1340-268=1072. Charlie has 1072 more stickers than Ryan.
