Five cakes cost £2.50 how much do seven cakes cost

To get the answer. you have to find the unit rate.

To find the unit rate, divide 2.50 by 5 which is 0.5 or 50 cents.

(You can check to see if you did this right by multiplying, so. 5x5=2.5)

Then you multiply. 5 by 7 which is 3.5, or $3.50.