For this case what you can do is an average to calculate the number of hours it will take them to work together:
Let
t: average time.
hi: hours worked for each one.
n: number of teams.
The average will be given by:
t = (h1 + h2) / (n)
Substituting both values:
t = ((15) + (10)) / (2) = 12.5
answer
it would take 12.5 h to pave that same section of highway if both crews worked together
3d/6+4= 19
move +4 to the other side
sign changes from +4 to -4
3d/6+4-4= 19-4
3d/6= 15
Mutiply both sides by 6/3 to get d by itself
3d/6*6/3- Cross out 3 and 3 , divide by 3 and becomes 1
Cross out 6 and 6, divide by 6 and becomes 1
1*1*d= d
15(6/3)- Cross out 15 and 3, divide by 3
15/3= 5
3/3= 1
5/1= 5 , 5*6= 30
answer: d= 30
Πr^2=area 9=r 9^2=81π=254.47
Answer:
it should be 4.5
Step-by-step explanation:
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