A square is folded vertically twice and the resulting perimeter is 20 cm.What is the peremeter of the square?
make a sketch
let the original square be 4x by 4x, (avoiding fractions)
after 1 fold: 4x by 2x
after 2 folds: 4x by x
perimeter = 2(4x+x) = 20
5x = 10
x = 2
original square was 8 by 8
and original perimeter was 4(8) = 32