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Lady_Fox [76]
3 years ago
11

A woman drives an SUV that get 13 miles per gallon (mpg). Her husband drives a hybrid that’s gets 60 mpg. Every week, they trave

l the same number of miles. They want to improve their combined mpg. They have two options on how they can improve it. option 1: they can tune the SUV and increase its mileage by 1 mpg and keep the hybrid as it is. Option 2: they can buy a new hybrid that’s gets 85 mpg and keep the SUV as it is.
Mathematics
1 answer:
goblinko [34]3 years ago
4 0

Let total gallon consumed  by SUV in a week when it is travelling at a speed of 13 mpg = x gallon

Total distance traveled by SUV in a week =13 x miles

and by hybrid , total gallons consumed when it is travelling at a speed of 60 mpg = y gallon

Total distance traveled by Hybrid in a week = 60 y miles

Case 1:

When mileage of SUV= 14 mpg

Total distance traveled by Hybrid  in a week = 14 x

Total distance traveled by SUV in a week = 60 y

14 x=60 y, as distance traveled by both cars in a week is same.

Average of two cars

=\frac{14x+60y}{2}\\\\=\frac{14 x+14 x}{2}\\\\=14 x

Case 2:

Mileage of new Hybrid = 85 mpg

Then total distance traveled by Hybrid in a week= 85 y

As, distance traveled by SUV in a week = 13 x

13 x=85 y, as distance traveled by both cars in a week is same.

So, Average of two cars

 =\frac{13x+85 y}{2}\\\\=\frac{13 x+13 x}{2}\\\\=13 x

So, Option 1 will be better choice, they can tune the SUV and increase its mileage by 1 mpg and keep the hybrid as it is.

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