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Sun Z.

asked • 07/09/19

How would you solve this aptitude test for army?

In one hour, a machine can dig a hole with diameter 10 cm through a 1.75 m depth of consistently hard rock. The machine is required to dig to a total depth of 112 m. If the machine is used for a total of 7 hours per day, how many days will it take for the machine to complete the task?


(A) 9


(B) 10


(C) 27


(D) 28

Answer is B according to the book but how did they get the answer? I keep getting A

1 Expert Answer


Stephen C. answered • 07/09/19

New to Wyzant

M.S. Math

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