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Please help i have no idea with this lesson

Please help i have no idea with this lesson-example-1
User Elist
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2 Answers

3 votes
ABD-CBD=ABC

The whole minus one part equals the other part

70-30=40
User Fabian Pedregosa
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0 votes

Answer:

40

Explanation:

ABD-CBD=ABD

70-30=40

User Cereal
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