In percent it is 55%.
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If its a 4 by 5 grid, there are 20 squares because 4 times 5 =20 20 by 2 is 40 so there are 40 triangles because there are 2 triangles that fit into each square. Hope this helps!
11/20
11 over 20 = 11 ÷ 20 = 0.55
20 - 11 = 9
LCM of 11 and 20 is 220.