Noah spent 25 hours working on his car. He spent #4/5# of his time working on the transmission. How much time did Noah spend working on the transmission?

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Answer 1 · 2018-03-31T23:52:29

See below.

To solve this problem, you have to set up a proportion.

#x/25# #=# #4/5#

In this problem #x# is how any hours Noah spent on transmission.
To find #x# you have to cross multiply.

#x# #*# #5# #=# #5x#

#25# #*# #4# #=# #100#

Now, you have to divide the product of the constants constants that don't have a variable (#24# and #4#) by #5# to find #x#.

#100# #÷# #5# #=# #20#

Our final answer for #x# is #20#.

Noah spent a total of #20# hours, or #4/5# of his #25# hours, working on transmission.

I hope this helps (: