A copy machine makes 156 copies in 4 minutes and 20 seconds. How many copies does it make per minute?
help plz? thanks....
2007-04-16 10:42:14 · 5 answers · asked by faitherzbaby 1 in Science & Mathematics ➔ Mathematics
156 copies / 4.333333 minutes = 36 copies/minute
2007-04-16 10:45:07 · answer #1 · answered by Sancho 4 · 0⤊ 0⤋
156 copies in 4 minutes and 20 seconds
156/1 divided by 13/3=
156/1* 3/13=
13 becomes 1 and 156 becomes 12
12/1* 3/1=36 copies per minute
2007-04-16 17:51:11 · answer #2 · answered by Dave aka Spider Monkey 7 · 0⤊ 0⤋
The machine makes 156 copies in 4 and 1/3 minutes. The number of copies per minute then is 156 divided by 4 and 1/3, or:
156/(13/3) copies per minute
You then multiply top and bottom by 3/13, yielding
156 times 3/13 divided by 1
The final answer is 36 copies per minute.
2007-04-16 17:50:04 · answer #3 · answered by yp 3 · 0⤊ 0⤋
156/4 1/3 (20 secs is 1/3 of a minute)
=36 copies a minute
2007-04-16 17:46:27 · answer #4 · answered by cmb 2 · 0⤊ 0⤋
use ratios and convert it to seconds.
156 copies/260 seconds= x copies/60 seconds
then cross multiply. 156*60=260x
x=36 copies in one minute
2007-04-16 17:47:17 · answer #5 · answered by solidusnake 2 · 0⤊ 0⤋