The 60 students in class 61 subscribed to two kinds of publications. (2/3) of the students subscribed to "Youth Literature and Art", and 45% of the students subscribed to "China Youth Daily". How many people subscribed to both publications? ?
六1班60名学生共订了两种刊物，有(2/3)的同学订了《少年文艺》，有45%的同学订了《中国少年报》，两种刊物都订的有多少人？
<gadget id="calculator">2 / 3</gadget>
<output>2/3 = around 0.666667</output>

<gadget id="calculator">45 / 100</gadget>
<output>9/20 = around 0.45</output>

<gadget id="calculator">(9/20) - 1</gadget>
<output>-11/20 = around -0.55</output>

<gadget id="calculator">(2/3) + (-11/20)</gadget>
<output>7/60 = around 0.116667</output>

<gadget id="calculator">60 * (7/60)</gadget>
<output>7</output>

<result>7</result>