The average GPA for 6th graders is 93, the 7th graders is 2 more than the 6th graders and the 8th graders average GPA is 91.  What is the average GPA for the school?
The 7th graders average GPA is 2 more than the 6th graders GPA of 93 so 93+2 = 95.
If you combine the GPA for all three grades then they have 93+95+91 = 
<gadget id="calculator">93+95+91</gadget>
<output>279</output>
279.
The average GPA for the school is 279/3 = 
<gadget id="calculator">279/3</gadget>
<output>93</output>
93.

<result>93</result>