The average of 9, 11, and 16 is equal to the average of 21, 4.6, and

Question

The average of 9, 11, and 16 is equal to the average of 21, 4.6, and what number?

A. 9.4
B. 9.8
C. 10
D. 10.2
E. 10.4

LevanKhukhunashvili · Answer

9+11+16=36
21+4.6+x=36
x=10.4

IMO
Ans:  E

NandishSS · Answer

average of 9, 11, and 16 is equal to the average of 21, 4.6, ==>  \frac{9+11+16}{3}=\frac{21+4.6+x}{3}

x= 36-25.6 = 10.4

Hence E

Kinshook · Answer

Average of 9, 11, 16 = 12
Average of 21, 4.6 and x = 12
x = 36 - 21 - 4.6 = 10.4

IMO E

Lampard42 · Answer

Since 3 numbers on both sides; Sum of 1st set = Sum of 2nd

9+11+16=25.6+x

X=10.4 IMO E

Archit3110 · Answer

equate both sides
36=25.6+x
x=10.4
IMO E

CareerGeek · Answer

—> (9 + 11 + 16)/3 = (21 + 4.6 + x)/3
—> 36 = 25.6 + x
—> x = 10.4

IMO Option E

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