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My elder sister divided the watermelon into 16 parts. I ate 7 out of them . My friend ate 4. How much did we eat between us?

    My elder sister divided the watermelon into 16 parts. I ate7 out of them. My friend ate 4. How much did we eat between us? How much more of the watermelon did I eat than my friend? What portion of the watermelon remained?

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I ate=\frac{7}{16}

My friend ate =\frac{4}{16}

we both eat

\frac{7}{16}+\frac{4}{16}=\frac{7+4}{16}=\frac{11}{16}

the watermelon more I eat than my friend is 

\frac{7}{16}-\frac{4}{16}=\frac{7-4}{16}=\frac{3}{16}

The portion of the watermelon remained

1-\frac{11}{16}=\frac{16-11}{16}=\frac{5}{16}

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