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Measuring Length

Shobha has ...

Question

Shobha has $18 m$ of ribbon. She wants to cut it into two pieces such that the length of one pieces is $4 m$ then the other. Find the length of the other.

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Solution

$a + b = 18 c m$
$a = 4 + b$
$b + 4 + b = 18$
$2 b = 14$
$b = 7$

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