Ruth has already jarred 3 liters of jam and will jar an additional 1 liter of jam everyday. How much

[math_celebrity]

Ruth has already jarred 3 liters of jam and will jar an additional 1 liter of jam everyday. How much jam did Ruth jar if she spent 7 days making jam?

7 days at 1 liter = 7 x 1 = 7.

Add that 7 to our original 3 and we have, 7 + 3 = 10 liters of jam.