If a is the offset of concrete bed in cms, and d is the depth of concrete bed in cms, then

If a is the offset of concrete bed in cms, and d is the depth of concr

1.	If a is the offset of concrete bed in cms, and d is the depth of concrete bed in cms, then
A.	none of these.
B.	d = 0.445 a
C.	0.557 a
D.	d = 0.775 a
Answer» D. d = 0.775 a