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John has a bag of coins in which he keeps all of his pennies, nickels, and quarters and no other coins. The mean value of the coins in his bag is 20 cents. If he were to add one quarter to his bag, the new mean value would be 21 cents. How many quarters did he originally have in his bag? 

 Aug 9, 2021
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P   N   Q

 

0   1   3 ==[0  +  5  +  75] / 4 ==20 cents - their mean value.

 

0   1   4 ==[0  +  5  + 100] / 5==21 cents - their mean value after adding a quarter.

 

The original number of quarters was==3

 Aug 10, 2021

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