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Eli started saving money in his empty piggy bank. He inserted $1 on every Monday, $2 on every Tuesday, $3 on every Wednesday, $4 on every Thursday, $5 on every Friday, $6 on every Saturday, and $7 on every Sunday. At the end of 13 days, he opened his bank and found he had $49. On which day of the week did he start inserting money into his piggy bank?

 Jul 16, 2022
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He started on Monday  and ends on a Saturday

 

The first week  he earns  1 + 2 + 3 + 4 + 5 + 6 + 7 = $28

 

And in the  next 6 days (starting on Monday, again)  he makes   1 + 2 + 3 + 4 + 5 + 6  =  $21

 

$28 +$21 =   $49

 

 

cool cool cool

 Jul 16, 2022

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