Joan is filling a 2liter soda bottle with different colors of sand to make an art project for her class. She has 1000 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

To find out how many liters of purple sand Joan will need to fill the bottle completely, we need to convert the other measurements to liters.

1000 milliliters = 1 liter
35 centiliters = 0.35 liters
2.5 deciliters = 0.25 liters

Total amount of red, blue, and yellow sand already in the bottle = 1 + 0.35 + 0.25 = 1.6 liters

Since the bottle is a 2-liter bottle, Joan will need 2 - 1.6 = 0.4 liters of purple sand to fill the bottle completely.