plz help everyone..a math question..
abt proportions.
Q: 80 machines can produce 4800 identical pens in 5 hours.
At this ratio:
1. how many pens would one machine produce in one hour?
2. how mnay pens would 25 machines produce in 7 hours?
thnx everyone ..plz show ur work.
2006-09-23 02:04:52 · 16 answers · asked by Anonymous in Education & Reference ➔ Homework Help
thank u guys..that is great!! I understood it all..
2006-09-23 02:22:05 · update #1
80 machine - 4800 pens - 5 hours
80 machines - 960 pens - 1 hour
1 machine - 12 pens - 1 hour.
25 machines- 300 pens - 1 hour
25 machines - 2100 pens - 7 hours.
2006-09-23 02:12:34 · answer #1 · answered by alldienow9000 2 · 0⤊ 1⤋
4800/80=60 60/5=12 PENS AN HOUR
12*7=84 84*25=2100 pen an hour
2006-09-23 02:44:24 · answer #2 · answered by sweetthing1986_us 2 · 0⤊ 0⤋
1)
if(80 machines)
if 4800---> in 5 hours
x ----->in 1hour
cross multiply : 5x=4800 => x=4800/5 => x=960 (for 80 machines)
to get the answer for one machine=> x=960/80 =>
x=12 pens
2) if in 1 hour, 1 machine produces 12 pens, then in 7 hours, 1 machines produces 12*7=84 pens
But we have 25 machines,then 25*84=2100 pens
2006-09-23 02:16:02 · answer #3 · answered by Anonymous · 0⤊ 1⤋
First, you need to find how many pens 80 machines can produce in 1 hour.
(4800/5)=960
Then you need to solve the first problem. Since you already know that 80 machines can produce 960 pens per hour, divide 960 by 80 to figure out how many can be produced by 1 machine in an hour.
(960/80)=12
To solve the second part of the problem, you need the solution to the first part of the problem. you need to multiply the number of pens (12) by the number of machines (25) to get the number of pens produced by the machines in one hour.
(12*25)=300
Then, multiply that number (300) by the amount of time the machines will be producing pens (7 hours) to receive the answer to the second part of the problem.
(300*7)=2100 pens
Good luck.
2006-09-23 02:16:01 · answer #4 · answered by the watcher 1 · 0⤊ 1⤋
4800 divided by 80 =60 pens per machine divded by 5 hours =12 pens for one machine in an hour. 12 multiplied 7 hours=84 x25=2100
2006-09-23 02:21:10 · answer #5 · answered by h2o4me2 1 · 0⤊ 1⤋
No. of pens produced by 80 machines in 5 hrs.=4800
No. of pens produced by 80 machines in 1hr.=4800/5=960
No.of pens produced by 1 machine in 1 hr.=960/80=12
No.of pens produced by 1 machine in 7hrs.=12*7=84
No. of pens produced by 25 machines in7hrs.=84*25=2100
Solution:-
1 machine produces 12 pens in 1hr.
25 machines produce 2100 pens in 7 hrs.
2006-09-23 02:28:52 · answer #6 · answered by sid g 2 · 0⤊ 1⤋
#1. 4800 divided by 5=960 then 960 divided by 80=12 per hour by one machine
#2. 12 x 25 =300 then 300x7=2100 in 7 hours by 25 machines
Hope this helps
2006-09-23 02:17:27 · answer #7 · answered by NotSoTweetOne 4 · 0⤊ 1⤋
1. how many pens would one machine produce in one hour?
4800/80=60
2. how mnay pens would 25 machines produce in 7 hours?
60x25=420
2006-09-23 02:09:22 · answer #8 · answered by landkm 4 · 0⤊ 1⤋
Start dividing, hon. What, specifically, do you not understand about these two problems? (I need to know what you don't understand so I can help you understand it.)
I'll get you started.
If you say... pens per hour. That means you take the number of pens divided by the number of hours. 4800 / 5 = number of pens per hour (for 80 machines running).
Now you keep going... Use ADD DETAILS to post your answers, and then we can look at what you do/don't understand.
2006-09-23 02:12:15 · answer #9 · answered by Anonymous · 0⤊ 0⤋
4800/80/5 = 12 x 25 x 7 = 2100.
2006-09-23 02:17:58 · answer #10 · answered by miserably waiting for her 1 · 0⤊ 1⤋