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done
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draw model to visualize :)
Date Posted:
6 years ago
Thank you, it was very help ful, but why 12 deducted twice?
as you can see from the model:
w is made up one unit + 12 + 18
R is made up of one unit + 12
C is made up of one unit
so the total of w, r and c is made up of three units + 12 + 12 + 18 :)
w is made up one unit + 12 + 18
R is made up of one unit + 12
C is made up of one unit
so the total of w, r and c is made up of three units + 12 + 12 + 18 :)
done
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make use of models and you will be able to visualize the answer :)
Date Posted:
6 years ago