There is 7 girls and each girl 210 legs has 7 cats, how many legs
are in the group?
There are 7 girls, and each girl has 2 legs, so the total number of legs from the girls is 7 x 2 = <<7*2=14>>14 legs.
There are also 7 cats, and each cat has 4 legs, so the total number of legs from the cats is 7 x 4 = <<7*4=28>>28 legs.
Therefore, the total number of legs in the group is 14 + 28 = <<14+28=42>>42 legs. Answer: \boxed{42}.