A) 55 people said their favorite vehicle color is red
B) 80 people said their favorite vehicle color was blue while 60 people said their favorite vehicle color was white
C) 45 said their favorite vehicle color was black while 10 people said their favorite vehicle color was silver
Let the speed of Brian = X
Brian drove at X miles per hour for 4 hours
Jake drove at X-15 for 4 hours
Set up an equation to get:
4x + 4(x-15) = 500 miles
Simplify:
4x + 4x -60 = 500
8x - 60 = 500
Add 60 to both sides:
8x = 560
Divide both sides by 8:
X = 560/8
X = 70
Brian's speed was x = 70 miles per hour.
Jake's speed was x - 15 = 70-15 = 55 miles per hour.
Answer:
24 minutes
Step-by-step explanation:
$30 - 0.12x = $27.12
-0.12x = -2.88
x = 24