anonymous
  • anonymous
Jeff is baking a cake. The recipe says that he has to mix 32 grams of vanilla powder to the flour. Jeff knows that 1 cup of that particular vanilla powder has a mass of 128 grams. He added 2/3 of a cup of vanilla powder to the flour. Should Jeff add more vanilla powder to make the exact recipe, or did he go over and by what amount? He needs to add 1/4 of a cup He went over by 5/12 of a cup He went over by 1/4 of a cup He needs to add 5/12 of a cup
Mathematics
katieb
  • katieb
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mathstudent55
  • mathstudent55
The amount of vanilla the recipe calls for is what fraction of a cup? The recipe calls for 32 grams. 1 cup is 128 grams. 32 grams is what fraction of 128 grams?
anonymous
  • anonymous
1/4
mathstudent55
  • mathstudent55
Great. The recipe calls for 1/4 cup. Jeff added 2/3 cup. What is more, 2/3 or 1/4?

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anonymous
  • anonymous
2/3
mathstudent55
  • mathstudent55
Correct. Now we know he added too much and does not add to add more. The question remaining is how much extra did he add? For that we subtract: 2/3 - 1/4
mathstudent55
  • mathstudent55
To subtract fractions, you need a common denominator. What is the LCD of 3 and 4? |dw:1434381094795:dw|
anonymous
  • anonymous
5/12
mathstudent55
  • mathstudent55
Correct.
anonymous
  • anonymous
so the went over by 5/12
mathstudent55
  • mathstudent55
|dw:1434381206160:dw|
mathstudent55
  • mathstudent55
Exactly. Good job!

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