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A student solved this problem and said the answer was 3 1/4 miles.



Cassie ran for 1 1/4 miles, then walked for 2 1/6 miles, and then ran for 2 1/2 miles. How many miles did Cassie walk and run?



Is the student's answer reasonable?


A.
Yes, the answer is reasonable.

B.
No, the answer is not reasonable. It should be about 15 miles.

C.
No, the answer is not reasonable. It should be about 10 miles.

D.
No, the answer is not reasonable. It should be about 6 miles.

Respuesta :

Hey there!

[tex] 1\dfrac{1}{4} + 2 \dfrac{1}{6} + 2 \dfrac{1}{2} \\ = \dfrac{5}{4} + \dfrac{13}{6} + \dfrac{5}{2} \\ = \dfrac{15}{12} + \dfrac{26}{12} + \dfrac{30}{12} \\ = \dfrac{71}{12} \\ = 5 \dfrac{11}{12} [/tex]

After rounding off, it would be about 6 miles.

Answer is D.

Hope this helps. - M
ugapup
The answer is D. add everything up and the answer would be 5.91666..., or about six.

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