Basic College Mathematics (10th Edition)

Published by Pearson
ISBN 10:
ISBN 13:

Chapter 5 - Ratio and Proportion - Review Exercises - Page 376: 17

Answer

Required proportion : $\frac{2 left-handed-students}{15 total-students} = \frac{x left-handed-students}{650 total-students}$ Solution : $x \approx 87$, i.e. 87 students can be expected left handed out of 650 students.

Work Step by Step

About 2 out of every 15 people are left-handed. How many of the 650 students in our school would you expect to be left-handed? Round to the nearest whole number. As per the details given: $\frac{2 left-handed-students}{15 total-students} = \frac{x left-handed-students}{650 total-students}$ (Assumed x as a required no of left handed students) i.e. $2 \times650 = 15 \times x$ (As bot sides have same numerator and denominator) Now, divide both sides by 15, $1300 \div 15 = 15 x \div 15$ $ x = 86.7 \approx 87$
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