Gabriela’s grade was in the 90th percentile out of 100 grades in her class. In another class of 100 students there were 80 grades lower than Gabriela’s. If nobody had Gabriela’s grade, then Gabriela was what percentile of the two classes combined?  Select
A) 90	B) 85	C) 80	D) 75	E) 70
Being in 90% percentile out of 100 grades means was 91st (from the least grade) in the class (as long as nobody had Gabriela 's grades), she outscored 90.   In another class her grade would rank her 61 (from the least grade out of 101, 100+ Gabriela), 60 had the grades lower than Gabriela.   So in combined classes she outscored  90+60= 
<gadget id="calculator"> 90+60</gadget>
<output>150</output>
150. There are 200 students  150/200= 
<gadget id="calculator"> 150/200</gadget>
<output>3/4 = around 0.75</output>
0.75   Answer: D (75%)   Generally being in x% means that x% has the grades less than you.   Gabriela in 90% --&gt; she outscored 90% of of 100=90 (Gabriela is 91st).   Of the 100 grades from another class, 60 were lower than Gabriela, hence Gabriela outscored 60.   So out of total  100+100= 
<gadget id="calculator"> 100+100</gadget>
<output>200</output>
200, Gabriela outscored   90+60= 
<gadget id="calculator">  90+60</gadget>
<output>150</output>
150. Hence she is in 150/200=75%.   Answer:75
<result>D</result>
Gabriela’s grade was in the 90th percentile out of 100 grades in her class. In another class of 100 students there were 80 grades lower than Gabriela’s. If nobody had Gabriela’s grade, then Gabriela was what percentile of the two classes combined?