There are 19 students in the 3rd grade and twice that number in the 4th grade. There are 10 boys and 19 girls in the 2nd grade. How many students are there in total?
In the third grade, there are 
<gadget id="calculator">19</gadget>
<output>19</output>
19 students.
In the fourth grade, there are 2 * 19 = 
<gadget id="calculator">2*19</gadget>
<output>38</output>
38 students.
Counting the boys and girls in the second grade, there are 10 + 19 = 
<gadget id="calculator">10+19</gadget>
<output>29</output>
29.
There are 19 + 38 + 29 = 
<gadget id="calculator">19+38+29</gadget>
<output>86</output>
86 students in total.

<result>86</result>