How do you solve using tape diagrams use a symbol for the unknown

Bruce is getting materials for a chemistry experiment his teacher gives him a container that has 0.25 liter of liquid in it. bruce need to use 0.4 of this liquid for the experiment. how much liquid will bruce use?

How do you convert 1.27 to a percentage

If a || b and b | y, then ? a) x || y. b) x | a. c) a | y. d) a || y.