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-Dominant- [34]
3 years ago
12

One printing press can print the whole school newspaper in 12 hours, while another press can print in 18 hours. How long will th

e job take if both presses work simultaneously?
Mathematics
1 answer:
rusak2 [61]3 years ago
8 0

Answer:

7 Hours 12 Minutes

Step-by-step explanation:

So they one of the printer increases at a rate of 1/12 and the other increases at a rate of 1/18. Since you don't know the time it actually takes, you will replace both numerators with and x. (x/12 and x/18). You want to set these up so that they are adding. (x/12 + x/18=1). Since you're adding, you want to change it to the same denominator. The lowest is 36 so you multiply x/12 by 3/3 (so you don't unbalance the equation) and x/18 by 2/2. You'll end up with 3x/36 + 2x/36= 1 which will simplify to 5x/36=1. Multiply each side by 36 to leave the variable by itself. It becomes 5x=36 and when you divide it by 5 you get 7.2. So it's seven and .2 hours, which is equivalent to7 and 1/5 of an hour or 7 hours and 12 minutes.

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An item costs $430 before tax, and the sales tax is $25.80.
bekas [8.4K]

Answer:

Step-by-step explanation:

if the item is 430, and the sales tax is 25.80

we can find how much is 1%

430/100=4.30

25.80/4.30=6

the sales tax is 6%

8 0
3 years ago
8- 5 (a + b) + 3 (a - 2b)
Alexeev081 [22]

Answer: 8-2a-11b

.....

7 0
3 years ago
A patrolman spends three times as many hours patrolling as she does completing paper work. If she works 36 hours per week, how m
fomenos

Answer:

27 hours

Step-by-step explanation:

Let her work "x" hours for paperwork

Since, patrolling amount of hours is THREE TIMES that,

Patrolling = 3x hours

Total Hours = 36

That is including paperhour work (x) and patrolling (3x). So we can setup an equation in x and solve for x first:

x + 3x = 36

4x = 36

x = 36/4

x = 9 hours

Amount of Hours for Patarolling = 3x hours = 3(9) = 27 hours

So, she spends 27 hours patrolling

4 0
3 years ago
What is the area of this parallelogram?
kirza4 [7]

Answer:

132, (D)

Step-by-step explanation:

area = base * height

= (5 + 6) * 12 = 11 * 12 = 132

5 0
2 years ago
Read 2 more answers
The ratio of the measures of all three angles in a triangle is 14:5:11. Find the measures of the angles.
Maru [420]

Answer:

30, 66 and 84 degrees.

Step-by-step explanation:

The number of degrees in a triangle is 180 degrees.

Work out the 'multiplier':

It = 180 / (14+5+11)

= 180/30

= 6.

So the angles are:

14*6 = 84

5*6  = 30

11*6  = 66.

6 0
3 years ago
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