Let the three numbers be x, y and z. Then x+y+z=75.
z = 2x. y = x - 9.
Eliminate y and z by substitution: x + (x - 9) + (2x) = 75
Then 4x = 75 + 9, or 4x = 84. x = 21, y = 21 - 9 = 12, and z = 2(21) = 42.
Check: Do 21, 12 and 42 add up to 75?
0.625 = 0.625 / 1
Numerator = 0.625 × 10 × 10 × 10 = 625
Denominator = 1 × 10 × 10 × 10 = 1000
Numerator / Denominator = 625 / 1000
Our simplifed fraction is:
= 625/1000
= 5/8
Answer:
x < 2
Step-by-step explanation:
8x -1 < 15
8x -1 (+ 1) < 15 (+ 1)
8x < 16
x < 2
Answer:
67 mph
Step-by-step explanation:
A method you'd want to remember is r = d/t, or rate equals distance divided by time.
Since the Morris family drove 368.5 miles in 5.5 hours, you'd divide the distance by 5.5.
(368.5/5.5) = 67 miles per hour.
So their average rate is 67 miles per hour.
Hope this helps.
