First, notice that 1/5 = 0.20. With this in mind, the examples that can be represented by the equation y = 1/5x are the following:
1.-Bananas are on sale for $0.20. Let x represent the number of bananas and y represent the total cost,in dollars
2.-For every 10 gallons of water, Jasmine adds 2 cups of Soap. Let x be the gallons of water and y the cups of soap.