SOLUTION: The weight of a rectangular block of metal varies jointly as its length, width and thickness. If the weight of a 12 by 8 by 6 in. block of aluminum is 18.7 lb., find the weight of

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Question 905276: The weight of a rectangular block of metal varies jointly as its length, width and thickness. If the weight of a 12 by 8 by 6 in. block of aluminum is 18.7 lb., find the weight of 16 by 10 by 4 in. block.
This is a kind of a variation word problem. Thank you so much and God bless.
Answer by josgarithmetic(39620) About Me  (Show Source):
You can put this solution on YOUR website!
m for weight (which really should be mass, not weight).
x,y,z for length width thickness

highlight_green%28m=kxyz%29, your formula.

The specific case described gives 18.7=k%2812%2A8%2A6%29
k=18.7%2F%2812%2A8%2A6%29
k=0.0324

You can revise your formula to highlight%28m=xyz%2A0.0324%29.