There are 28 students in a classroom. Half of them have 5 notebooks each and the other half have 3 notebooks each. How many notebooks in total are in the classroom?
Half of the class consists of 28 students / 2 = 
<gadget id="calculator">28/2</gadget>
<output>14</output>
14 students.
One half of the students have 14 students * 3 notebooks/student = 
<gadget id="calculator">14*3</gadget>
<output>42</output>
42 notebooks.
The other half have 14 students * 5 notebooks/student = 
<gadget id="calculator">14*5</gadget>
<output>70</output>
70 notebooks.
There are 42 notebooks + 70 notebooks = 
<gadget id="calculator">42+70</gadget>
<output>112</output>
112 notebooks in total in the classroom.

<result>112</result>