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Mathematics, 06.08.2019 22:10 icee13

Ihave 31 stamps in total. i have 4 more 1 cent stamps than 8 cent stamps and twice as many one cent stamps as 12 cent stamps. if my stamps are worth $1.78 altogether how many one cent stamps do i have?

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Ihave 31 stamps in total. i have 4 more 1 cent stamps than 8 cent stamps and twice as many one cent...
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