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Ferran has to sell 20 buttons to raise money for the art club. He sold 1/2 of the buttons to her neighbors and 1/2 of the remainder to his friends. How many buttons did Ferran have left to sell?

 Apr 16, 2021
 #1
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sell 1/2 ....then 1/2 left

 

1/2 left   sell 1/2   then   1/4 left

1/4 * 20 = 5 left to sell

 Apr 16, 2021
 #2
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start: 20 buttons

1/2 sold to neighbors: 10 buttons

1/2 of the remainder = 1/2 * (1 - 1/2) = 1/4 ---> 5 buttons

 

 

buttons left = 20 - 10 - 5 = 5 buttons

 Apr 16, 2021

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