In 2010, car a was the highest mileage car available in a country. it's estimated highway mileage was 4 miles per gallon more than car b . if the two cars could travel a total of 90 miles on a gallon of gasoline, find the mileage of each car.

Car B = 43 miles per gallon

Car A = 43+4=47 miles per gallons

Step-by-step explanation:

Let the mileage of Car B be x miles per gallon

Hence the mileage of Car A will be x+4 miles per gallon

Distance traveled by each car in 1 gallon

Car A = x+4

Car B = x

Total Distance covered by both car in 1 gallon = x+(x+4) which is given as 90 miles

Hence x+(x+4)=90

2x+4=90

2x=86

dividing both sides by 2 we get

x=43

Mileage of Car B = 43 miles per gallon

Mileage of Car A = 43+4=47 miles per gallons

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step-by-step explanation:

a 4/6 = 9/12   not proportional

step-by-step explanation:

to find which are not proportional, we can use cross products

if it is true, they are proportional.   if it is not true, they are not proportional.

a 4/6 = 9/12

4* 12 = 6*9

48 = 54

not this is not proportional  

b 2/3 = 12/18  

2* 18 = 3 * 12

36 = 36

this is proportional

c 5/4 = 10/8  

5*8 = 4*10

40 = 40

this is proportional

d 7/5 = 35/25

7*25 = 5 * 35

175 = 175

is proportional