SOLUTION: Katrina needs 3/5 kilogram of flour for a recipe.  Her  mother has 3/7 kilogram in her pantry.  Is this  enough flour to make the recipe  If not, how much more will she need? 

Algebra ->  Percentage-and-ratio-word-problems -> SOLUTION: Katrina needs 3/5 kilogram of flour for a recipe.  Her  mother has 3/7 kilogram in her pantry.  Is this  enough flour to make the recipe  If not, how much more will she need?        Log On


   

Question 830503: Katrina needs 3/5 kilogram of flour for a recipe.  Her  mother has 3/7 kilogram in her pantry.  Is this 
enough flour to make the recipe  If not, how much more will she need? 
Found 2 solutions by josgarithmetic, MathTherapy:
Answer by josgarithmetic(39620) About Me  (Show Source):
You can put this solution on YOUR website!
Not enough.

3%2F5-3%2F7 more kilograms needed.
21%2F35-15%2F35
6%2F35, about 171 grams.

The bigger denominator is the with the smaller number for a given numerator.

Answer by MathTherapy(10553) About Me  (Show Source):
You can put this solution on YOUR website!
Katrina needs 3/5 kilogram of flour for a recipe.  Her  mother has 3/7 kilogram in her pantry.  Is this 
enough flour to make the recipe  If not, how much more will she need?


Amount of flour needed:   3%2F5 kg = 3%287%29%2F5%287%29 = 21%2F35 kg ------- Multiplying by common denominator, 35 



Amount of flour she has:  3%2F7 kg = 3%285%29%2F7%285%29 = 15%2F35 kg ------- Multiplying by common denominator, 35 



As seen, she doesn't have enough flour.



She'll need 21%2F35+-+15%2F35, or highlight_green%286%2F35%29 kg more.



You can do the check!! 



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