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ashlon98
03.02.2021 •
Mathematics
A student spends 5/6 hour grading 3/5 of a student's essay. At this rate, how long does it take the teacher to grade the students entire essay?
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Ответ:
Step-by-step explanation:
Given that :
Time spent = 5/6
Fraction of students graded = 3/5
Amount of time grading 3/5 of students = 5/6 hours
Total fraction of students = 1/1
If 3/5 of students take 5/6 hours
Then, 1/1 of students will take x
Using cross multiplication :
3/5 = 5/6
1 = x
3x / 5 = 5/ 6
3x * 6 = 5 *5
18x = 25
x = 25 / 18
x = 1.38888 hours
Ответ:
3-a=-14 ( multiply by 7 on both sides)
-a=-14 (subtract 3 from both sides)
a=14 (divide both sides by negative 1)
a=14