You can put this solution on YOUR website! YOU NEGLECTED TO DEFINE THE SOLID. RECTANGLE OR PYRAMID?
IF A RECTANGLE THEN:
L*W*H=VOLUME
11*5*X=165
55X=165
X=165/55
X=3 YDS IS THE HEIGHT.
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IF A PYRAMID THEN:
1/3B*H=VOLUME
1/3(11*5)H=165
55H/3=165 CROSS MULTIPLY
55H=3*165
55H=495
H=495/55
H=9 YARDS.