36 banners
1 yard = 3 feet
12 yards:
= 12 yards * 3 feet/1 yard
= 36 feet
thus, 36 banners can be made.
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36 banners
3 feet to 1 yard so 12yd = 12 X 3 = 36 feet. So assuming that foot per flag allows for trimming and hemming, 36 banners.
One sq yd is 9 sq ft, (3ft x 3ft) so 12 sq yds is 108 sq ft (12 x 9 sq ft)
12 ft is 4 yd, and 18 ft is 6 yd, so we have 24 sq yds.
There are 12 feet in 4 yards so the ratio is 4:12 feet.