If 1/2 a lemon will make 1/3 of a gallon of lemonade, how manny lemons will it take to make a full gallon of lemonade?

1.5 lemons.
l/2:g/3
1.5l:1g

It will take 1,1/2 lemons, how I got my answer.

First we must understand it takes 1/3, 2/3, 3/3, to make a full gallon, so multiply 1/2×3=1,1/2 lemons will make a full gallon.

I hope this helps.