How many cups are in 30g of mashed potatoes?

The density of mashed potatoes is approximately 0.9 g/cm³. So, the volume of 30 g of mashed potatoes is 30 g / 0.9 g/cm³ = 33.3 cm³. 1 cup is equal to 236.6 cm³. So, 33.3 cm³ is equivalent to approximately 33.3 cm³ / 236.6 cm³ = 0.14 cups.

Therefore, there are approximately 0.14 cups in 30g of mashed potatoes.