Question

For each 70mm of coloured fabric Alex uses to make his curtains, he also uses 20cm of white fabric. Express the amount of white fabric to coloured fabric as a ratio in its simplest form.

Answer 1

2 : 7

Explanation:

We can convert the 70mm of colored fabric to cm first:

Since 1 cm = 10mm, this means 70mm = 7 cm.

Now, we can set up a ratio with white:colored since they are both in cm now:

20 : 70

We can divide each side by 10 to simplify:

2 : 7