In designing a stair, the sum of going (in cm) and twice the rise (in cm) should be equal to

In designing a stair, the sum of going (in cm) and twice the rise (in

1.	In designing a stair, the sum of going (in cm) and twice the rise (in cm) should be equal to
A.	40
B.	50
C.	60
D.	70
Answer» B.