A copy machine makes 36 copies per minute. How many copies does it make in 4 minutes and 15 seconds?
Stacey Warren - Expert brainly.com
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First convert the minutes into seconds, since they gave you minutes and seconds.
1 min = 60sec.
4:15 min = 255sec.
So now, plot it. 36 copies in 60 sec. = x copies in 255 sec.
Cross multiply: 36*255 = 9,180 & 60*x = 60x
Divide: 9180/60 = x
Solve: 151 = x
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It's much simpler to convert seconds to minutes first
Yes but you'll end up with 2 types of information. For instance, it is given that theres 36 copies in a minute and how many copies are in 4 minutes and 15 seconds. Theres that seconds, so you'll need to convert all into seconds since nothing will change, its just the form they are in. Proportion.
Yes hero, you can always do that first. Divide the first term. 36/60 = 0.6 copies per second. then go for that.
So When you convert Seconds to minutes notice that 15 Seconds is 1/4 of a minute or 0.25 minutes. In this case, the total number of minutes to consider is 4.25 minutes. We'd multiply that by 36 to get
36(4+1/4) = 144+9 = 153
If you're good enough you can do the entire process using mental math.