The answer to the question u asked is A
N=12
Since 5/6 and n is being multiplied, you have to divide the 5/6 from both sides. When you divide with a fraction, you have to find it’s reciprocal and multiply with it. So the 5/6 turns into 6/5
5/6 * 6/5 = 30/30 which is one.
10 * 6/5 is 60/5
60/5= 12
This is eazy 630=90x
divide 90 on both sides
7=x
x=in
7feet=1in