THE AVERAGE OF FOUR NUMBERS IS 9. WHAT IS THE FOURTH NUMBER IF THRE...

DE THI TOAN QUOC TE KANGAROO NAM 2016 LOP 9 10 CO DAP AN DE TIENG ANH

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1. The average of four numbers is 9. What is the fourth number if three of the numbers are 5, 9 and 12?

(A) 6 (B) 8 (C) 9 (D) 10 (E) 36