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# What is the weight of one of three identical bricks?

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Math Expert
Joined: 02 Sep 2009
Posts: 50572
What is the weight of one of three identical bricks?  [#permalink]

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07 Feb 2018, 20:22
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Difficulty:

25% (medium)

Question Stats:

83% (00:49) correct 17% (01:45) wrong based on 32 sessions

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What is the weight of one of three identical bricks?

(1) Two bricks weigh as much as three 6-lb. weights.

(2) Three bricks weigh as much as one brick plus 18 lbs.

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What is the weight of one of three identical bricks?  [#permalink]

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07 Feb 2018, 20:47
We are able to understand from the question stem that the weight
of the three bricks are equal.

Assume the weight of one of the three books be x.

(1) Two bricks weigh as much as three 6-lb. weights.
If 2 bricks weigh as much 3*6lb, 2x = 18 -> x = 9lb
Hence, the weight of one of the bricks is 9lb (Sufficient)

(2) Three bricks weigh as much as one brick plus 18 lbs.
Translating from the statement, we can say 3x = x + 18
Again 3x - x = 2x = 18lb -> x = 9lb (Sufficient - Option D)
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What is the weight of one of three identical bricks? &nbs [#permalink] 07 Feb 2018, 20:47
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