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18 Mar 2024, 01:30
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A
Be sure to select an answer first to save it in the Error Log before revealing the correct answer (OA)!
Difficulty:
35%
(medium)
Question Stats:
71% (01:58) correct
29%
(02:54)
wrong
based on 175
sessions
History
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Time
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Not Attempted Yet
If 2w + y = 47, 3y + z = 112, and 2w + 3z = 21, what is the average of w, y, and z?
A. 15
B. 25
C. 50
D. 100
E. It cannot be determined from the information given.
A. 15
B. 25
C. 50
D. 100
E. It cannot be determined from the information given.
18 Mar 2024, 01:46
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A (15)
Adding all of the equations gives 4 times sum of all, using sum we can find the average
Posted from my mobile device
Adding all of the equations gives 4 times sum of all, using sum we can find the average
Posted from my mobile device
18 Mar 2024, 01:48
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Bunuel
2w+y=47........(1)
2w+3z=21......(2)
3y+z+112.......(3)
adding equation (1),(2) and (3)
we get
4w+4y+4z=180
4(w+y+z)=180
w+y+z=180/4
we get w+y+z=45
divide 45 by 3 ( number of term in set i.e w,y,z) we get 15 as answer
