gapaxton22
17.07.2019 •
Mathematics
Aclass of 90 students from civil, mechanical and electrical engineering backgrounds is divided into 2 sections (sections a and b). section a contains of 15 civil engineers and a total of 40 students. section b contains 20 mechanical engineers. there are a total 40 civil engineers and 30 mechanical engineers in the class. (a)what is the probability that a randomly selected student from section a is an electrical engineer? (b) what is the probability that a randomly selected student is a civil engineer and from section b?
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Ответ:
a). 62.50%
b). 57.14%
Ответ:
x=23
Step-by-step explanation:
2x + 17 - 10 = 3x - 20 + 4
2x+7=3x-16
-2x -2x
7=x-16
+16 +16
23=x
or
x=23
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