Answer:
9/13 or 0.69 yards
Step-by-step explanation:
To find the amount of fabric per scarves, divide the number of yards by the number of scarves.
9/ 13 = 0.69 yards per 1 scarf
This is the fundamental zero additive rule
x - 0 = x
which means that for the set of real numbers, there exist a number such that if added (or subtracted) from any other will not affect such number.
Area of the board divided by the time
2 x 3 = 6ft^2
15/6= 2.5mins
