Problema Solution
Tina had a big order of cookies in a total of 225 cookies.It took her to decorate all the cookies in 3 1/2 hours.Approximately how long did it take her per cookie?
Answer provided by our tutors
3 1/2 = (3*2 + 1)/2 = 7/2 hours
225 cookies in 7/2 hours
1 cookie in x hours
225 : (7/2) = 1 : x
by solving the equation we find
x = 7/450 hours = 7*60/450 min = 7*60*60/450 sec = 56 sec
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it took her 56 seconds to make one cookie.