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Sagot :
Kyle drove x hours
Sally drove x + 7 hours
Added together they both drove 2x + 7 hours
2x +7 = 35 hours
Subtract 7 from both sides:
2x = 28
Divide both sides by 2:
x = 14
Kyle drove 14 hours
Sally drove 21 hours
Kyle drove for 14 hours and Sally drove for 21 hours
Let number of hours Kyle drove = x
Let number of hours Sally drove = x+7
Therefore,
x + (x + 7) = 35
2x + 7 = 35
Collect like terms
2x = 35 - 7
2x = 28
x = 28/2
x = 14
Also, x + 7 = 24 + 7 = 21
Therefore, Kyle drove for 14 hours and Sally drove for 21 hours.
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