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01 Jan 2018, 10:38
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C
Be sure to select an answer first to save it in the Error Log before revealing the correct answer (OA)!
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90% (00:51) correct
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If the average (arithmetic mean) of a and b is 50 and the average (arithmetic mean) of b and c is 70, what is the value of c – a ?
A. 10
B. 20
C. 40
D. 60
E. It cannot be determined from the information given.
A. 10
B. 20
C. 40
D. 60
E. It cannot be determined from the information given.
01 Jan 2018, 13:45
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Bunuel
If \(\frac{a + b}{2} = 50\), then
\(a + b = 100\), and similarly
\(c + b = 140\)
Subtract first equation from second equation.
\(c + b = 140\)
\(a + b = 100\)
··························
\(c - a = 40\)
Answer
02 Jan 2018, 00:30
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Bunuel
\(\frac{(a + b)}{2}\) = 50
a + b = 100
b = 100 - a -----> (I)
\(\frac{(b + c)}{2}\) = 70
b + c = 140 ------> (II)
Using equation I & II we get c - a = 40 (C)
