Discussion
A pipe is 30 m long and is 45% longer than another pipe. Find the length of the other pipe.
Answer: A
"45% longer" means the 30 m pipe is 1.45 times the other.
\[ 30 = 1.45x \quad\Longrightarrow\quad x = \frac{30}{1.45} = 20.69 \]
Taking 45% off 30 would give 16.5, a different quantity: the percentage is measured against the shorter pipe, not the longer one.
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