Oliver had 135 stickers. He used 1/3 of his stickers, gave 2/5 of the remaining to his friend, and kept the remaining stickers. How many stickers did he keep?
Oliver used 1/3 x 135 = 
<gadget id="calculator">1/3*135</gadget>
<output>45</output>
45 stickers.
So, there were 135 - 45 = 
<gadget id="calculator">135-45</gadget>
<output>90</output>
90 stickers remaining.
His friend received 2/5 x 90 = 
<gadget id="calculator">2/5*90</gadget>
<output>36</output>
36 stickers.
Therefore, Oliver kept 90 - 36 = 
<gadget id="calculator">90-36</gadget>
<output>54</output>
54 stickers.

<result>54</result>