Which strategy would not correctly solve this story problem?

Kent had some muffins at his bake sale table. He had twice as many muffins as bagels. He had 10 bagels. Kent sold 5 muffins before lunch and then sold another 6 muffins after lunch. How many muffins did Kent have left?

A.
Use objects to model the problem. Take 10 blocks. Take away 5 blocks and then add 6 blocks.

B.
Use logical reasoning. There were 10 bagels. Twice as many muffins as bagels means there were 20 muffins. Kent sold 6 + 5 muffins, so subtract 11 from 20 to find out how man

Question

Which strategy would not correctly solve this story problem? 

 

Kent had some muffins at his bake sale table. He had twice as many muffins as bagels. He had 10 bagels. Kent sold 5 muffins before lunch and then sold another 6 muffins after lunch. How many muffins did Kent have left?
 

  A. 
  Use objects to model the problem. Take 10 blocks. Take away 5 blocks and then add 6 blocks.   
    


  

  B. 
  Use logical reasoning. There were 10 bagels. Twice as many muffins as bagels means there were 20 muffins. Kent sold 6 + 5 muffins, so subtract 11 from 20 to find out how man

tkhunny · Answer

Either "Strategy" should work just fine.  Unfortunately, the first "Strategy" was implemented quite poorly.  It's not the "Strategy"'s fault.