Question

Louisa needs 3 L of lemonade and punch for a picnic. She has 1800 mL of lemonade. How much punch does she need

Answer 1

1 L = 1000 mL
1800mL=1.8L
she needs 3 L which is 3000 mL.
so she needs 1.2 L which is 1200 mL after the 1800mL