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Six balls, each of radius 5 centimeters, are placed side by side in a

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Six balls, each of radius 5 centimeters, are placed side by side in a [#permalink]

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New post 29 Nov 2017, 23:05
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Six balls, each of radius 5 centimeters, are placed side by side in a straight row with adjacent balls touching. What is the distance, in centimeters, between the center of the first ball and the center of the last ball?

(A) 40
(B) 45
(C) 50
(D) 55
(E) 60
[Reveal] Spoiler: OA

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Six balls, each of radius 5 centimeters, are placed side by side in a [#permalink]

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New post 29 Nov 2017, 23:26
C.

The distance is r+2r+2r+2r+2r+r. Here r=5
Solving we get 50


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Re: Six balls, each of radius 5 centimeters, are placed side by side in a [#permalink]

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New post 29 Nov 2017, 23:37
Bunuel wrote:
Six balls, each of radius 5 centimeters, are placed side by side in a straight row with adjacent balls touching. What is the distance, in centimeters, between the center of the first ball and the center of the last ball?

(A) 40
(B) 45
(C) 50
(D) 55
(E) 60


The distance = 4*10 + 2*5 = 50
C
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Kudos [?]: 2 [0], given: 57

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Re: Six balls, each of radius 5 centimeters, are placed side by side in a [#permalink]

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New post 03 Dec 2017, 18:56
Bunuel wrote:
Six balls, each of radius 5 centimeters, are placed side by side in a straight row with adjacent balls touching. What is the distance, in centimeters, between the center of the first ball and the center of the last ball?

(A) 40
(B) 45
(C) 50
(D) 55
(E) 60



Since the radius of each ball is 5, the diameter of each ball is 10. Thus, the six diameters (one for each circle) will line up to form a total length of 60. However, to determine the distance from the center of the first ball to the center of the last ball, we only need the radius of the first and the radius of the last, along with the diameters of the four balls in between them; thus, the distance is 5 + 10 x 4 + 5 = 50. .

Answer: C
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Kudos [?]: 1011 [0], given: 3

Re: Six balls, each of radius 5 centimeters, are placed side by side in a   [#permalink] 03 Dec 2017, 18:56
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