The metric units I cho'

I was about to weigh a 12-year old who said she must have lost weight because she danced all summer. I looked at her chart, which said she was 150 in june. When I told her she was now 135lb, she did a joyful moonwalk. Her mother then told me quietly... there must have been a mistake. I took another look - she was actually 150cm...and 118lb. As you can imagine, the smile was soon gone ... yet the pounds remained.