Answer:
30 minutes
Step-by-step explanation:
Nathaniel can weld 1 rail in 75 minutes, so he welds 1R = 75 min, and Brenda can weld 1 rail in 50 minutes (25 minutes faster than Nathaniel), so she welds
1R = 50 min
We want to see how many minutes it takes them both, so we need to solve both problems for the minute unit
Nathaniel: (1/75)R = 1 min (he can do one seventy-fifth of a rail per minute)
Brenda: (1/50)R = 1 min (she can do one fiftieth of a rail per minute)
notice, the equation is 1/(minutes it takes them), and we want to see how long it takes both of them, so we get the equation:
1/75 + 1/50 = 1/x
Simplify the left side with common denominator of 57(50) = 3750
We get
125/3750 = 1/x
We can cross multiply to get rid of the fractions...
125x = 3750
Divide both sides by 125 to solve for x...
x = 30, so it would take them 30 minutes to weld a rail if they work together.
Answer:
- x < -55
- x ≤ 3
- x > 1
Step-by-step explanation:
x/-5 + 17 > 4
-1/5x + 17 > 4
-1/5x > -13
x < -65
3x - 27 ≤ -18
3x ≤ 9
x ≤ 3
-6x - 1 < -7
-6x < -6
x > 1
Best of Luck!
Answer:
30%.
First find the difference between the two prices.
195 - 136.5 = 58.5
Next find percent of difference over original cost.
58.5/195 = 0.30
The percent discount is 30%.
To check:
195 * 0.70 = 136.5 <---------- CORRECT.
Answer:
D, 0.19
Step-by-step explanation:
So first you add up all the candies
you’ll get 79 pieces of candy
So 4 pieces of green candy
So we can just subtract 4 from 79 you’ll get 75 pieces
It still works becuase we know that 4 pieces gone are green so the other candies still have the same amount
Now there are 14 red pieces
So 14/75
Now simplify that and you’ll Get
0.18666666
Now round that, 0.19
