Anne is 2 times as tall as her sister while Bella is 3 times as tall as Anne. If Anne is 80cm tall, what is the height difference between Bella and Anne's sister?
Anne is 2 times as tall as her sister hence 2*(her sister's height) = 80cm.
Her sister's height = 80cm/2 = 
<gadget id="calculator">80/2</gadget>
<output>40</output>
40cm.
Bella is 3 times as tall as Anne hence Bella's height is 3*80 cm = 
<gadget id="calculator">3*80</gadget>
<output>240</output>
240 cm.
The height difference between Bella and Anne's sister = 240-40 = 
<gadget id="calculator">240-40</gadget>
<output>200</output>
200cm.

<result>200</result>