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answer = 15/2 ....OR .... 7.5 ...
limits of x , y ans z are 0 to 5 each ...
Now , f=(x+y+z) ..so its triple integral in this limit = 625/2+625/2+625/2 = 1875/2
And volume = 125 ...
So we divide these two and get answer = 15/2
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