put 18 over 100. You get 18/100. Then, put a question mark over 200. It will look like this. 18/100=?/200. Then, to get from 100 to 200, you multiply by 2. Do the same with 18 to get to the mystery number. The answer will be 36
put 18 over 100. You get 18/100. Then, put a question mark over 200. It will look like this. 18/100=?/200. Then, to get from 100 to 200, you multiply by 2. Do the same with 18 to get to the mystery number. The answer will be 36