Elementary Algebra

Published by Cengage Learning
ISBN 10: 1285194055
ISBN 13: 978-1-28519-405-9

Appendix - Extra Word Problems - Page 523: 3



Work Step by Step

Let the unknown number here be $x$. Four times a certain number is $4x$. 3 added to four times a certain number means $4x+3$. Therefore, if 3 is added to four times a certain number, the result is 23 means that: $4x+3=23$ Solving the above equation, we obtain: $4x+3=23$ $4x=23-3$ $4x=20$ $x=\frac{20}{4}$ $x=5$ Therefore, the unknown number is $5$.
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