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

Sue is learning to ski and her lessons are 1/4, 1/2 " or " 3/41/4, 1/2 " or " 3/4 of an hour long. How many hours of coaching has she had if she had fourteen lessons of 1/41/4 hour, 99 of 1/21/2 hour and 77 of 3/43/4 hour?