John collects baseball cards. He has 23 cards. Jack ha…

John collects baseball cards. He has 23 cards. Jack has 6 times as many cards. How many cards does Jack own?

Answers

138

Explanation:

How many cards does John have? Variable set: #x#
John has 23 cards. #x=23#
How many cards does Jack have? Variable set: #y#
Jack has 6 times as many cards [as John]. #y=6\cdotx=6x#

We now have two equations:
#x=23#
#y=6x#
The first one is a variable value, so substitute #x=23# into the second equation...
#y=6\cdot\color(red)(23)=138#

Jack has 138 baseball cards.

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