the chocolate pie recipe needs 4 cups of flour, 4 eggs and 1.5 cups of water. to double the recipe, 30% more water should be added. How many cups of water should be added to double the recipe?

How do I solve this one?

Well, you would need to find out how much of 1.5 cups is 30%.

To do this you would multiply 1.5 by 30/100 or 30%.

The product you get is how much more water should be added in addition to the 1.5 cups.

Maybe some culinary experts could enlighten me, but ...

if you "double" the recipe, wouldn't you just double all the ingredients ??

Anyway, taking the wording at face value, you would need 1.3(1.5) cups of water or
1.95 cups of water

I'm hardly a "culinary expert," but if I doubled the recipe I'd multiply all of the ingredients by 2. I'd use 3 cups of water to double the recipe.

To solve this problem, we'll need to follow a few steps:

Step 1: Calculate the amount of water needed for the original recipe.
The original recipe calls for 1.5 cups of water.

Step 2: Find 30% of the original amount of water.
To find 30% of any number, we multiply the number by 0.30 (or 30% as a decimal).
30% of 1.5 cups of water = 0.30 * 1.5 = 0.45 cups

Step 3: Calculate the total amount of water needed for the doubled recipe.
To double the recipe, we need to double all the ingredients, including the water. So, we add the original amount of water (1.5 cups) to the additional 30% (0.45 cups) of water.
Total water needed for the doubled recipe = 1.5 cups + 0.45 cups = 1.95 cups

Therefore, to double the recipe, you should add 1.95 cups of water.