If and are tread and rise respectively of a stair, then

1.	If and are tread and rise respectively of a stair, then
A.	2R + T = 60
B.	R + 2T = 60
C.	2R + T = 30
D.	R + 2T= 30
E.	3R + 27 = 30
Answer» B. R + 2T = 60

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If and are tread and rise respectively of a stair, then

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