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Question

The point C divides the line segment AB in the ratio 3:7. Find the length of AB (in cm) if the line segment BC is 3.5 cm long.

A
4 cm
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B
5 cm
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C
6 cm
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D
7 cm
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Solution

The correct option is B 5 cm
ACBC=37
Therefore,
ABBC=BCBC+ACBC=1+37=107
ABBC=107
Now,
AB=BC×107=3.5×107=5 cm

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