Sisi and Weiwei went to the stationery store to buy school supplies together. Sisi had 4.8 yuan, and Weiwei had 7.86 yuan. They combined the money to buy two boxes of the same school supplies. After returning home, how much should Sisi give Weiwei?
思思和薇薇一起到文具店买学具，思思有4.8元，薇薇有7.86元，他们将钱合在一起刚好能买到两盒同样的学具．回家后，思思应该给薇薇多少钱才合理？
<gadget id="calculator">4.8 + 7.86</gadget>
<output>12.66</output>

<gadget id="calculator">12.66 / 2</gadget>
<output>6.33</output>

<gadget id="calculator">6.33 - 4.8</gadget>
<output>1.53</output>

<result>1.53</result>