Xiao Pang omitted the parentheses when calculating 4*(1.6+□)+5.2*0.5, so the result was 2.7 less than the correct answer. What is the number in □.
小胖在计算4*(1.6+□)+5.2*0.5时，将括号省略掉了，这样结果比正确答案少了2.7，问□里的数是多少．
<gadget id="calculator">2.7 / 3</gadget>
<output>0.9</output>

<result>0.9</result>