Answers

2015-09-09T11:28:16+08:00

3BC + 2D = $18

1BC + 2D = $10

_____________

2BC = $8

BC = $4 ( cost Box of chalk )

1BC + 2D = $10

$4 + 2D = $10

D=$3( cost of duster )

Total cost is $7

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