DWASS
19.01.2020 •
Mathematics
Ineed with this anybody know it?
3(2n-7)=9
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Ответ:
5
Step-by-step explanation:
3(2n-7)=9
^ ^
6n-21=9
+21 +21
6n=30
6 6
n=5 :)
Ответ:
6 mile/hour
Explanation :
Let the speed of walking of James = x mile/hour
speed of jogging = 2x mile/hour
9/2x + 1.5/x = 2
= > (9 + 3)/2x = 2
= > 12 = 4x
= > x = 3
Average speed of walking = 3 mile/hour
Average speed of jogging = 2 * 3 = 6 mile/hour