The total length of three rulers is 58cm. The total length of ruler A and ruler B is 40cm. The total length of ruler B and ruler C is 36cm. what is the length of ruler B?
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Step-by-step explanation:
A + B + C =58 cm
A + B = 40 cm
B + C = 36
Therefore, A + 2B + C = 76
Therefore , B = 76 - 58
=18
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