Question

Joan is filling a 2 liter soda bottle with different colors of sand to make an art project for her class. She has
1,000 milliliters of red sand, 35 centiliters of blue sand, and 2.5 deciliters of yellow sand in the bottle, but it is not full yet. How many liters of purple sand will she need to use to have the bottle completely full?

Answer 1

Convert each amount to liters: 1000 mL = 1.0 L, 35 cL = 0.35 L, 2.5 dL = 0.25 L.
Total sand so far = 1.0 + 0.35 + 0.25 = 1.6 L.
Remaining to fill 2 L = 2.0 − 1.6 = 0.4 L.

Joan needs 0.4 liters (400 mL) of purple sand.