Evaluate the expression -please teach 6th grade math

10 -X +y when x= 3.45 and y = 2.78
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10-3.45+2.78=9.33
by Level 3 User (4.1k points)
at the beginning of 6th grade the ratio of the number of advanced math students to the number of regular math students was 3:8 however after taking placement tests students were moved around changing the ratio of the number of advanced math students to the number of regular math students to 4:7 how many students started in regular math and advanced math if there were 92 students in advanced math after the placement
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