Solution witout Algebra:
If the extra 3 hours are separated from 37 hours of the trip, we get34 hours which is driven equally by Sarah and Michael. So, 34/2=17 hours are equally driven by both out of 34 hours. Now add Sarah's part of extra 3 hours. So, Sarah drove 17+3 =20 Hours, and Michel drove 17 hours.
Method of Agebra:
The driving hours by Sarah is known in terms of driving of Michale plus 3 hours.. So, the unknown hours of driving of Michale is assumed to be x hrs which is the basic unknown to solve in this word problem. Then Sarah's duration of driving is x+3 hours. So, their total hours of driving (algebaically)=x+x+3=2x+3 hours. Butsthis is equal to 37 hours. The basic requirement of the word problem is to set up an equation. So,the equation of this word problem is:
2x+3=37
where x is the basic unknown hours of Michale's driving hours. Once you solve for x, you get x+3 as duration in hours of Sarah's driving.
Solving the equation:
2x+3=37
Subtract 3 from both sides:
2x+3-3=37-3
2x=34
Divide both sides by 2
2x/2=34/2
x=17 hours, is the duration of Michel's drive and
x+3=17+3=20 hours is that of Sarah's.
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