& The average of three numbers is 8. The first two numbers are 5 and 12. Find the third number. (A) 6 (B) 7 (C) 8 (D) 8.5
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Answer:
for any 3 number avg u must divide sum/3
so,
5+12=17 ;17/3 is not equal to 8
so 8×3=24
5+7+12=24; 24÷3=8
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