Erica mixed 1 1/5 cups of wheat flour,2 2/5 cups rye flour, and 2 3/5 cups white flour together. How many cups of flour did she mix together?

Question

answer A. 6 1/5
answer B. 6
answer C. 5 4/5
answer D. 5 1/5

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Answer 1 · 2018-06-18T03:34:15

A. $6 1/5$

Add all the whole numbers $-> 1 + 2 + 2 = 5$
Add the fractions $-> 1/5 + 2/5 + 3/5 = 6/5$
all of the fractions have a common denominator $(5)$ , so you simply add the numerator (top digit)
Simplify improper fraction to a mixed number $-> 6/5 = 1 1/5$
Add whole and mixed number $-> 5 + 1 1/5 = 6 1/5$

Answer 2 · 2018-06-18T03:42:42

The answer is $"A")$ $6 1/5$

$color(red)(1 1/5) + color(blue)(2 2/5) + color(green)(2 3/5$

Since all of the fractions have the same denominator, we can add the whole numbers and the numerators of the fractions.

$color(red)1 + color(blue)2 + color(green)2 + color(red)(1/5) + color(blue)(2/5) + color(green)(3/5$

Add the whole numbers first.

$5 + color(red)(1/5)+color(blue)(2/5)+color(green)(3/5$

Add the numerators.

$5 + 6/5$

Simplify $6/5$ to $1 1/5$ .

$5 + 1 1/5$

Simplify $5 + 1$ to $6$ .

$6 1/5$