Five cakes cost 4.00 how much do 7 cost

5 divided by 4 cause there's 5 cakes and they cost 4 dollars that gives us 1.25 per cake so one cake cost 1.25 5 cakes is 4$ add 1.25$ to get 6 cakes and another 1.25$ to give you 7 cakes in total the answer is 7 cakes cost $6.50

You need to divide 5/4 and youll get the price for 1 cake (1.25) then just add 2 more times to 5 (6.5) is the total