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How many did she sell the first week

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1 Answer

total card = 41
let the number of cards on the first week  = c
2nd week = c (sold same amount)
3rd week = c ( sold same as 1st week)
last week = 5
 
so when we add all the weeks the total should be 41
c +c+c+5 = 41
combine like terms
3c + 5 = 41
subtract 5 from both sides
3c = 36
divide by 3
c = 12
 
so she sold 12 tickets the first 3 weeks