A bag full of sugar weighs 16 kg. A bag full of salt weighs 30 kg. If you remove 4 kg from the combined weight of these two bags, how much do the bags now weigh?
The bags together weigh 16 + 30 = 
<gadget id="calculator">16+30</gadget>
<output>46</output>
46 kg.
Removing the 4 kg, the bags will weigh 46 - 4 = 
<gadget id="calculator">46-4</gadget>
<output>42</output>
42 kg.

<result>42</result>