The area of a rectangular plot is 15 times its breadth. If the difference between the length and the breadth is 10 metres, what is its breadth? Select.
A) 10 metres  B) 5 metres  C) 7.5 metres  D) data inadequate  E) none of these

Rationale: "l × b = 15 × b ∴ l = 15 m and l – b = 10 ∴ b = 15 – 10 = 5 m answer b"
Answer: B