Sue is learning to ski and her lessons are #1/4, 1/2 " or " 3/4# of an hour long. How many hours of coaching has she had if she had fourteen lessons of #1/4# hour, #9# of #1/2# hour and #7# of #3/4# hour?

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Answer 1 · 2016-10-04T13:13:39

#13 1/4# hours

Multiply the number of lessons by the length of time for each lesson.
Many people like to write all the numbers as fractions. #14 = 14/1#

#14/1xx1/4 +9/1xx1/2 + 7/1xx3/4" "larr# simplify if possible

#cancel14^7/1xx1/cancel4^2 +9/1xx1/2 + 7/1xx3/4#

=#7/2+9/2+21/4#

=#3 1/2 +4 1/2+ 5 1/4#

=#13 1/4# hours