To find the total amount of flour needed for both the cake batter and muffin batter, we need to add the amounts of flour for each type of batter.
The amounts of flour are:
- Cake batter: \( \frac{3}{4} \) cup of flour
- Muffin batter: \( \frac{2}{3} \) cup of flour
To add these two fractions, we need a common denominator. The denominators are 4 and 3. The least common multiple (LCM) of 4 and 3 is 12.
Now we convert each fraction to have a denominator of 12:
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For \( \frac{3}{4} \): \[ \frac{3}{4} \times \frac{3}{3} = \frac{9}{12} \]
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For \( \frac{2}{3} \): \[ \frac{2}{3} \times \frac{4}{4} = \frac{8}{12} \]
Now, we can add the two fractions: \[ \frac{9}{12} + \frac{8}{12} = \frac{17}{12} \]
So the total flour needed is \( \frac{17}{12} \) cups. To express this in a mixed number form: \[ \frac{17}{12} = 1 \frac{5}{12} \]
Thus, the total amount of flour needed in total to make both the cake and muffin batter is \( \frac{17}{12} \) cups or \( 1 \frac{5}{12} \) cups.