I think the orange one is correct.
10m+27 you add the sides to find perimeter so add 2m+2m+2m and so on and it gives u 10m+27
12 is 20% of 60 because 12/60 = 0.2.
3/7 = 9/x
cross multiply because thats how u solve proportions
(3)(x) = (7)(9)
3x = 63
x = 63/3
x = 21
and if u will notice : 3/7 and 9/21 ....9/21 reduces to 3/7....so these are equivalent fractions...because proportions are nothing but equivalent fractions
