Answer:
Step-by-step explanation:
1.The solution contains 20 mL of methanol and 100 mL of water.
2.The solution contains 20 mL of methanol and 80 mL of water.
3.The solution contains 20 g of methanol and 100 mL of water.
4.The solution contains 20 g of methanol and 80 mL of water.