Question

Which option is a solution that is 20% (m/m) methanol in water?

The solution contains 20 g of methanol and 80 mL of water.
The solution contains 20 mL of methanol and 100 mL of water.
The solution contains 20 g of methanol and 80 g of water.
The solution contains 20 mL of methanol and 80 mL of water.

Answer 1

4th one has 20 ml of methanol in 80ml of water

Answer 2

second option is correct that is
the solution contains 20ml of methanol and 100 ml of water:
=mass percentage=mass of solute/mass of solution×100
=mass percentage=20/100×100
=mass percentage=20percent