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Nurse Joe recorded the weights of each of the five babies born yesterd

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Nurse Joe recorded the weights of each of the five babies born yesterd  [#permalink]

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New post 12 Jan 2018, 18:43
00:00
A
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C
D
E

Difficulty:

  25% (medium)

Question Stats:

80% (01:48) correct 20% (01:41) wrong based on 34 sessions

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Nurse Joe recorded the weights of each of the five babies born yesterday. What is the arithmetic mean of the weights of the five babies?
(1) The cumulative weight of the first three babies was 21 pounds.
(2) The cumulative weight of the last three babies was 24 pounds.

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Re: Nurse Joe recorded the weights of each of the five babies born yesterd  [#permalink]

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New post 12 Jan 2018, 19:12
mandeey wrote:
Nurse Joe recorded the weights of each of the five babies born yesterday. What is the arithmetic mean of the weights of the five babies?
(1) The cumulative weight of the first three babies was 21 pounds.
(2) The cumulative weight of the last three babies was 24 pounds.



Many Q are on these lines..
a,b,c,d,e..
We are looking for a+b+c+d+e/5
1) a+b+c=21..
Nothing about d and e
Insufficient
2) c+d+e=24
Nothing about a and c
Insufficient..

Combined..
a+b+c+c+d+e=21+24=45...
But c is added twice and we don't know the individual weight.
Insufficient
E
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1) Absolute modulus : http://gmatclub.com/forum/absolute-modulus-a-better-understanding-210849.html#p1622372
2)Combination of similar and dissimilar things : http://gmatclub.com/forum/topic215915.html
3) effects of arithmetic operations : https://gmatclub.com/forum/effects-of-arithmetic-operations-on-fractions-269413.html


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Re: Nurse Joe recorded the weights of each of the five babies born yesterd &nbs [#permalink] 12 Jan 2018, 19:12
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Nurse Joe recorded the weights of each of the five babies born yesterd

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