If the average (arithmetic mean) of b and c is 5, and the average of c and d is 10, then b - d =
A. Cannot be determined
B. -5
C. -10
D. -15
E. -20
OA C
Source: Magoosh
If the average (arithmetic mean) of b and c is 5, and the average of c and d is 10, then b - d = A. Cannot be determine
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\begin{cases}BTGmoderatorDC wrote: ↑Fri Sep 25, 2020 5:27 pmIf the average (arithmetic mean) of b and c is 5, and the average of c and d is 10, then b - d =
A. Cannot be determined
B. -5
C. -10
D. -15
E. -20
OA C
Source: Magoosh
b + c = 10 \qquad (1) \\
c + d = 20 \qquad (2)
\end{cases}
Subtracting \((1)\) from \((2)\) we have,
\(b - d = -10\)