We are given: Initial amount of the gas = 30 gallons.
Milage of the Troy’s truck = 21 miles per gallon.
Number of gallons of gas used in 1 miles = 1/21 gallons.
Let us assume, number of miles Troy truck travel = m miles.
Number of gallons of gas used in travelling m miles = m * 1/21 = 1/21 m.
And number of gallons of gas left after travelling m miles = g gallons of gas.
Number of gallons of gas = Total gas present initially - Number of gallons gas used to travel m miles.
Therefore, we can setup an equation.
g = 30 - 1/21 m.
Answer:
n= -12
Step-by-step explanation:
- 2n/3 + 7=15 Subtract 7 from both sides and move all terms containing
-7 = -7 n to the right
- 2n/3 = 8 multiply both sides of equation by - 3/2
-3/2 x (-2n/3) = -3/2 x 8
n= -3/2 x 8 cancel the common factor of 3
n= -12
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