Mark took a test yesterday that consisted of 75 questions. He completed the test at a rate of 5 questions per hour. Today, he took another test of 100 questions at the same rate. If Mark had 8 hours to complete the first test and 6 hours to complete the second one, how many questions did he leave incomplete?
Questions Mark completed in yesterday's test: 5*8 = 
<gadget id="calculator">5*8</gadget>
<output>40</output>
40.
Questions Mark completed in today's test: 5*6 = 
<gadget id="calculator">5*6</gadget>
<output>30</output>
30.
Questions Mark left incomplete in yesterday's test: 75-40 = 
<gadget id="calculator">75-40</gadget>
<output>35</output>
35.
Questions Mark left incomplete in today's test: 100-30 = 
<gadget id="calculator">100-30</gadget>
<output>70</output>
70.
Missed questions in total 35+70 = 
<gadget id="calculator">35+70</gadget>
<output>105</output>
105.

<result>105</result>