Jane is picking strawberries to make into strawberry jam. The number of jars she will be able to fill with jam depends on the amount of strawberries she picks.

j = the number of jars Jane will be able to fill with jam
s = the amount of strawberries Jane picks

Which of the variables is independent and which is dependent?

The variable "s" (amount of strawberries Jane picks) is the independent variable, as it is being controlled or manipulated by Jane. The variable "j" (number of jars Jane will be able to fill with jam) is the dependent variable, as it depends on the amount of strawberries picked by Jane.