John buys 3 different coolers.  The first one is 100 liters.  The second is 50% bigger than that and the third is half the size of the second.  How much total water can they hold?
The second cooler is 100*.5=
<gadget id="calculator">100*.5</gadget>
<output>50</output>
50 liters bigger than the first.
So it is 100+50=
<gadget id="calculator">100+50</gadget>
<output>150</output>
150 liters.
The third is 150/2=
<gadget id="calculator">150/2</gadget>
<output>75</output>
75 liters.
So the total water they can hold is 100+150+75=
<gadget id="calculator">100+150+75</gadget>
<output>325</output>
325 liters.

<result>325</result>