Charlie has 5 times as many stamps as ryan. they have 1,608 stamps in all. how many more stamps does charlie have than ryan ?

Charlie has 1072 more stamps than ryan. This is because if x represents the amount of stamps that ryan has, then 5x represents how many charlie has. set up an equation, and you get 5x+x=1608, because all together they have 1608. Then collect(combine) like terms and you get 6x=1608. Divide both sides by 6 and you get x=268. Therefore ryan has 268 stamps, and charlie has 5x268 stamps, or 1340 stamps, and to get how many for charlie has, subtract his by ryan's, and you get 1340-268=1072

You do 1.25in times 15in and get 18.75in squared