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21. * MULTIPLe CHOICE A car used 15 gallons of ga

Updated on Sat Dec 23 2023

Question

- MULTIPLe CHOICE A car used 15 gallons of gasoline and traveled a total distance of 350 miles. The car’s fuel efficiency is 25 miles per gallon on the highway and 20 miles per gallon in the used on the find $h$ , the number of gallons that were
  (A) $350 = 25 (15 - h) + 20 h$
  (D) $15 = \frac{350}{25 h} + \frac{350}{20 h}$
  (C) $350 = (\frac{25 + 20}{2}) h$

To solve the problem, we can use the formula for distance traveled given the fuel efficiency and the number of gallons used:

d i s t a n c e = f u e l e f f i c i e n c y \times g a l l o n s

Plugging in the given values, we have:

350 = 25 h + 20 (15 - h)

Simplifying the equation, we get:

350 = 25 h + 300 - 20 h

Subtracting 300 from both sides, we get:

50 = 5 h

Dividing both sides by 5, we get:

h = 10

So, the number of gallons used on the highway was

h = 10

gallons.
Therefore, the answer is option

(B) 350 = 25 (15 - h) + 20 h