Answer this question for brainliest!

a)  1 : 1.5

Step-by-step explanation:

you can go from one rectangle as a ratio.

little one is rectanggle A

bigger one is rectangle B

if A is taken as the unit you can try equations

so:      1 : x

2*x = 3        and      5*x = 7.5

it has to be correct in both equations

therefore:

x=3/2 = 1.5

and you can see:

5*1.5 = 7.5

so:          1 : 1.5

b.) 160 miles on a 5 gallons car

step-by-step explanation:

240/10=24 miles/gallon

160/5=32 miles/gallon

30/1=30 miles/gallon

168/6= 28 miles/gallon

32 miles/gallon is the most amount, so this is the best.