A small store made 50 posters to advertise their products. Two-fifths of them are small posters while half of them are medium posters. The rest are large posters. How many large posters are there?
50 x 2/5 = 
<gadget id="calculator">50*2/5</gadget>
<output>20</output>
20 posters are small.
And 50/2 = 
<gadget id="calculator">50/2</gadget>
<output>25</output>
25 posters are medium.
So 20 + 25 = 
<gadget id="calculator">20+25</gadget>
<output>45</output>
45 posters are not large.
Therefore, 50 - 45 = 
<gadget id="calculator">50-45</gadget>
<output>5</output>
5 posters are large.

<result>5</result>