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Ronch [10]
3 years ago
15

Three girls bought a pizza for lunch. One girl ate 1/3 of the pizza another girl ate 1/4 of the pizza and the third ate the rest

of the pizza. How much of the pizza did the third girl eat?
Mathematics
1 answer:
Bad White [126]3 years ago
3 0
One ate  1/3,  Another ate = 1/4.

Total ate =  1/3 + 1/4  = (4 + 3) / 12 = 7/12

Fraction the third girl got =  (The whole =1)  minus 7/12

=  1 - 7/12 =  (12 - 7) / 12 = 5/12

The third girl ate 5/12 of the pizza.
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When Sam works alone, he can paint one room in 6 hours. When Jenna works alone, she can paint one room in 4 hours.

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Then , we have

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i.e.  \dfrac{1}{t}=\dfrac{1}{2}-(\dfrac{1}{6}+\dfrac{1}{4})

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i.e.  \dfrac{1}{t}=\dfrac{1}{2}-\dfrac{10}{24}

i.e.  \dfrac{1}{t}=\dfrac{1}{2}-\dfrac{5}{12}

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