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Let O and ∆ be digits. What is the sum of ∆.OOO + O. ∆∆∆? (1) ∆ + O =

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Joined: 02 Jun 2015
Posts: 192
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Let O and ∆ be digits. What is the sum of ∆.OOO + O. ∆∆∆? (1) ∆ + O = [#permalink]

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New post 28 Oct 2016, 08:04
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Difficulty:

  35% (medium)

Question Stats:

49% (00:46) correct 51% (00:35) wrong based on 53 sessions

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Let O and ∆ be digits. What is the sum of ∆.OOO + O. ∆∆∆?

(1) ∆ + O = 10
(2) ∆ = O

(Source: Bell Curves)

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Joined: 18 Sep 2016
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Re: Let O and ∆ be digits. What is the sum of ∆.OOO + O. ∆∆∆? (1) ∆ + O = [#permalink]

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New post 28 Oct 2016, 08:21
duahsolo wrote:
Let O and ∆ be digits. What is the sum of ∆.OOO + O. ∆∆∆?

(1) ∆ + O = 10
(2) ∆ = O

(Source: Bell Curves)



(1) Sufficient if you know that ∆ + O = 10 you know that

∆.OOO +
O. ∆∆∆=
----------
11.110

because the summ of the digits in each position is 10.

(2) clearly insufficient.
if ∆ = O =2 the sum is 4444
if ∆ = O =3 the sum is 9999

answer A
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Posts: 361
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Re: Let O and ∆ be digits. What is the sum of ∆.OOO + O. ∆∆∆? (1) ∆ + O = [#permalink]

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New post 13 Sep 2017, 01:04
damybox wrote:
duahsolo wrote:
Let O and ∆ be digits. What is the sum of ∆.OOO + O. ∆∆∆?

(1) ∆ + O = 10
(2) ∆ = O

(Source: Bell Curves)



(1) Sufficient if you know that ∆ + O = 10 you know that

∆.OOO +
O. ∆∆∆=
----------
11.110

because the summ of the digits in each position is 10.

(2) clearly insufficient.
if ∆ = O =2 the sum is 4444
if ∆ = O =3 the sum is 9999

answer A



Sorry, can you explain this in more detail?
Sufficient if you know that ∆ + O = 10 you know that

∆.OOO +
O. ∆∆∆=
----------
11.110

How did you get 11.11?
I Picked C :(
Re: Let O and ∆ be digits. What is the sum of ∆.OOO + O. ∆∆∆? (1) ∆ + O =   [#permalink] 13 Sep 2017, 01:04
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Let O and ∆ be digits. What is the sum of ∆.OOO + O. ∆∆∆? (1) ∆ + O =

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