Richard can make 8 dough balls in 2 hours. If the amount of time is directly proportional to the number of dough balls, how many hours have passed if he made 18 doughballs?

1 Answer
May 1, 2018

4.5 hours have passed.

Explanation:

First, start with your given data:

#(8/2)#, where 8 is the number of dough balls and 2 is the number of hours.

#(18/x)#, where 18 is the number of dough balls and #x# is the unknown number of hours.

Now, create a proportion to solve for x:

#(8/2)# = #(18/x)#

Cross-multiply.

#8x# = #36#

Now, divide by 8 to isolate #x#.

#36/8# = #4.5#

Therefore,

#x# = #4.5#