There are 45 students in Class 1, of which boys account for (4/9), and (1/10) boys are short-sighted. How many boys are short-sighted?
六1班有学生45人，其中男生占(4/9)，有(1/10)的男生眼睛近视，近视的男生有多少人？
<gadget id="calculator">4 / 9</gadget>
<output>4/9 = around 0.444444</output>

<gadget id="calculator">1 / 10</gadget>
<output>1/10 = around 0.1</output>

<gadget id="calculator">45 * (4/9) * (1/10)</gadget>
<output>2</output>

<result>2</result>