Roberto overtakes Juanita at the rate of (7.7 mi)/(11 h) = 0.7 mi/h. This is the difference in their speeds. The sum of their speeds is (7.7 mi)/1 h) = 7.7 mi/h.
Roberto walks at the rate (7.7 + 0.7)/2 = 4.2 mi/h.
Juanita walks at the rate 4.2 - 0.7 = 3.5 mi/h.
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In a "sum and diference" problem, one solution is half the total of the sum and difference. If we let R and J be the respective speeds of Roberto and Juanita, we have
R + J = total speed
R - J = difference speed
Adding these two equations, we have
2R = (total speed + difference speed)
R = (total speed + difference speed)2 . . . . . as computed above
Answer:
9
Step-by-step explanation:
Let the no be x
By the conditions given ,
2x + 6x = 72
8x = 72
x = 72/8
x = 9
therefore the no is 9
(1, 2)
(2, 4)
(3, 6)
(4, 8)
(5, 10)
2a = b is the relationship. Double a to get b.
Pints | Cups
1 2
2 4
3 6
4 8
5 10
There are 2 cups in each pint, so the table shows the relationship between 1-5 pints and cups.
Answer:
Ralph and Kyle got rid of 106 pounds of garbage.
Step-by-step explanation:
47 + 59 = 106
