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If the average(arithmetic mean) of 5 and r is 7 and the average of 3 and s is 3 , what is the average of r and s?
A) 3
B) 5
C) 6
D) 9

Respuesta :

Answer:

C

Step-by-step explanation:

Calculate the values of both r and s, that is

[tex]\frac{5+r}{2}[/tex] = 7 ( multiply both sides by 2 )

5 + r = 14 ( subtract 5 from both sides )

r = 9

and

[tex]\frac{3+s}{2}[/tex] = 3 ( multiply both sides by 2 )

3 + s = 6 ( subtract 3 from both sides )

s = 3

Hence

[tex]\frac{9+3}{2}[/tex] = [tex]\frac{12}{2}[/tex] = 6 → C

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