Question #eb630

2 Answers
Oct 17, 2017

About 5

Explanation:

There are #240# minutes in #4# hours. The number of bracelets you can make is equal to #240/45#, which is #5.3bar3#. Therefore, in #4# hours, you can complete #5# bracelets.

Oct 22, 2017

#4h# will be enough time to make #5# bracelets.

But, you may want to go for #6#.

Explanation:

If you can make a bracelet in #45# minutes (under an hour) and you have four hours, then you know you can make at least #4# bracelets.

Can you make any more in the four hours?
In each of those four hours, you had #60m-45m=15m# or

#4xx1/4h=1h# left over.

So you do have time to make the fifth bracelet. [ANS]

Do you want to make any more in the four hours?
Is it possible to make #6# bracelets in #4h#?

#4h=((60m)/(1hr))4hrto# notice the #6# and #4# in both equations.

From there we can guess that #6# bracelets can be made in #4h# iff we reduce the manufacturing time for each to #40m#.

Then: #4h=((60m)/(1hr))4hr=240m#

And: #6# bracelets #xx40m=240m#.