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# . The average weight of 26 dogs was found to be 12.5 kg. When 1 more d

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. The average weight of 26 dogs was found to be 12.5 kg. When 1 more d  [#permalink]

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07 Aug 2019, 01:13
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The average weight of 26 dogs was found to be 12.5 kg. When 1 more dog was added to this group, the average weight of the dogs was found to be 500gm more than the previous average weight. Find out the weight of the new dog that is added to the group

a. 20kg
b. 25kg
c. 26kg
d. 30kg
e. None of the above
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. The average weight of 26 dogs was found to be 12.5 kg. When 1 more d  [#permalink]

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07 Aug 2019, 02:15
500gm= 0.5kg
So, second average and number would be 13 and 27 respectively.
26×12.5 + X = 13×27
X = 351-325= 26
Option C

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Re: . The average weight of 26 dogs was found to be 12.5 kg. When 1 more d  [#permalink]

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07 Aug 2019, 02:19
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Average weight of 26 dogs is increased by 1/2 kg, so total increase in weight is 26 x 1/2 = 13 kg.

Weight of new dog = new average weight + increased weight = 13 + 13 = 26 kg

C is correct.
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Re: . The average weight of 26 dogs was found to be 12.5 kg. When 1 more d  [#permalink]

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12 Aug 2019, 10:55
GeorgeKo111 wrote:
The average weight of 26 dogs was found to be 12.5 kg. When 1 more dog was added to this group, the average weight of the dogs was found to be 500gm more than the previous average weight. Find out the weight of the new dog that is added to the group

a. 20kg
b. 25kg
c. 26kg
d. 30kg
e. None of the above

Notice that the sum of the weights of the 26 dogs is 12.5 x 26 = 325 kg. Let n = the weight of the dog, in kg, added to the group. We can create the equation (note: 500 g = 0.5 kg):

(325 + n)/27 = 0.5 + 12.5

325 + n = 13 x 27

325 + n = 351

n = 26

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Re: . The average weight of 26 dogs was found to be 12.5 kg. When 1 more d   [#permalink] 12 Aug 2019, 10:55