Ashley is making lemonade. the recipe she is using calls for $\frac{3}{4}$ cup of water. ashley wants to make five times the amount of lemonade that the recipe calls for. she mistakenly uses $4$ cups of water. if $x$ is the number of cups of water ashley is supposed to use and $y$ is the number of cups of water she actually uses, what is $x-y$? express your answer as a decimal.

x - y =  -  0.25 cups.

Step-by-step explanation:

Let x :  The number of cups of water Ashley is supposed to use

    y :  The  number of cups of water she actually uses

The actual measurement of water for 1 glass lemonade = 3/ 4 cup

So, the measurement of water for 5 glass lemonade  

=  5 x ( Measure of water for 1 glass) =

The amount of water Ashley actually uses for 5 glass lemonade  = 4 cups

⇒    = 3. 75 cups

   and   y = 4 cups

So, x - y = 3.75 cups  - 4 cups = -0.25 cups.

Hence, she used the amount 0.25 cups water extra while making 5 glass lemonades according to the given recipe.