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d. Grandma gave Kendra recipes for cranberry cookies and cranberry bread. One recipe calls for 
(2)/(3) cup cranberries, and the other recipe calls for 
1(3)/(4) cup. How many cups of cranberries will Kendra need to make both recipes?

d. Grandma gave Kendra recipes for cranberry cookies and cranberry bread. One recipe calls for 23 \frac{2}{3} cup cranberries, and the other recipe calls for 134 1 \frac{3}{4} cup. How many cups of cranberries will Kendra need to make both recipes?

Full solution

Q. d. Grandma gave Kendra recipes for cranberry cookies and cranberry bread. One recipe calls for 23 \frac{2}{3} cup cranberries, and the other recipe calls for 134 1 \frac{3}{4} cup. How many cups of cranberries will Kendra need to make both recipes?
  1. Identify amounts needed: Identify the amounts needed for each recipe. The first recipe needs 23\frac{2}{3} cup and the second needs 1341\frac{3}{4} cups.
  2. Convert to improper fraction: Convert the mixed number to an improper fraction for easier addition. 1(34)1\left(\frac{3}{4}\right) is the same as (44)+(34)\left(\frac{4}{4}\right) + \left(\frac{3}{4}\right), which equals (74)\left(\frac{7}{4}\right) cups.
  3. Add fractions with common denominator: Add the two fractions (23)(\frac{2}{3}) cup + (74)(\frac{7}{4}) cups. To add fractions, find a common denominator. The least common multiple of 33 and 44 is 1212.
  4. Convert to twelfths: Convert (23)(\frac{2}{3}) into twelfths by multiplying the numerator and denominator by 44, getting (812)(\frac{8}{12}). Convert (74)(\frac{7}{4}) into twelfths by multiplying the numerator and denominator by 33, getting (2112)(\frac{21}{12}).
  5. Add fractions with common denominator: Add the two fractions now that they have a common denominator: (812)+(2112)(\frac{8}{12}) + (\frac{21}{12}) equals (2912)(\frac{29}{12}).
  6. Convert back to mixed number: Convert the improper fraction (29)/(12)(29)/(12) back to a mixed number. 1212 goes into 2929 twice with a remainder of 55, so the mixed number is 25122\frac{5}{12} cups.

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