Before beginning voice lessons, Elizabeth already knew how to sing 15 pieces, and she expects to learn 2 new pieces during each week of lessons. How many weeks of lessons will Elizabeth need before she will be able to sing a total of 47 pieces?
2 Answers
16 weeks.
Explanation:
The first step is to find out how many more pieces she needs to learn
47 pieces - 15 pieces ( that she already knows = 32 pieces left to learn
She learns 2 pieces per week, per means to divide so divide 32 by 2
So the number of weeks to learn 32 more songs is 16
Explanation:
Consider the example of
~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
Total to know
Already know
Need to learn
Using ratio:
But we need to learn 32 so we have
Note that
So the number of weeks to learn 32 more songs is 16