Question

in 2012 five us postal stamps cost 2.20. how much did seven stamps cost

Answer 1

3.08 because 2.2 divide 5 because it is 0.44
0.44 times 7 is 3.08
~JZ

Answer 2

Answer=3.08

   5        7
____=____
2.20      x

cross multiply
5x=15.4
divide both sides by 5
x=3.08