They can go into 8*4*9 = 288. That is not the smallest such number, but that was not the question.
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the mean is the average; (9 +8+4 + X)/4 = 8; solve for X ; (21 +X)/4 = 8; X = 11
4 and 8/9
9 goes into 76 8 times, with 4 as a remainder 72/9=8 76-72=4
The mean average is (9 + 15 + 4 + 8) ÷ 4 = 9; The median average is (8 + 9) ÷ 2 = 8.5 The mode average doesn't exist as each number appears once.
9 can go into 44 4 times with a remainder of 8.