Question: solve by using a strip diagram to model the situation and write a numerical equation that could be used to solve problem. use a letter

solve by using a strip diagram to model the situation and write a numerical equation that could be used to solve problem. use a letter to represent the unknown quantity and explain the thinking process

Daniel has a collection of baseball cards. His mom gave him a set of 48 cards for his birthday. His grandmother gave him twice as many cards as his mother did. Now he has 352 cards. How many cards did he have before his birthday? Draw a strip diagram to model this situation and write a numerical equation that could be used to solve the problem with a letter used to represent the unknown quantity. Using a visual way 2 Strategy (algebra)

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