Answer :
The flour that Karina's mother has won't be enough for the recipe and she requires extra 3/20 together with the quality owed by the mother.
What is flour ?
Flour is defined as a food product that is the main ingredient for baking of different recipes such as cakes, breads, plate pies just to mention a few.
The amount of flour needed by Karina for the recipe= 3/5 = 0.6.
The amount of flour owed by the mother = 3/7 = 0.45
The difference between the available flour = 0.6 - 0.45 = 0.15
This shows that extra flour of 0.15 or 3/20 is needed in addition to the quantity of flour owed by the mother to be able to make the recipe.
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