Rectangular plot — “Half as long again” as broad (i.e., length = 1.5 × breadth). If area is 2/3 hectares, find the length (in meters).
-
A100 meters
-
B66.66 meters
-
C33 meters
-
D100/√3 meters
-
E80 meters
Answer
Correct Answer: 100 meters
Explanation
Introduction / Context:Translate the phrase “half as long again” to a ratio statement and convert the given area from hectares to square meters. Then solve for breadth and compute length.
Given Data / Assumptions:
- Length L = 1.5 * breadth B
- Area = 2/3 ha = (2/3)*10,000 = 6,666.666… m2
Concept / Approach:Area A = L * B = 1.5 * B^2 ⇒ B^2 = A / 1.5. Then length L = 1.5B.
Step-by-Step Solution:B^2 = 6,666.666… / 1.5 = 4,444.444… ⇒ B ≈ 66.666… mL = 1.5 * 66.666… ≈ 100 m
Verification / Alternative check:Area check: 100 * 66.666… ≈ 6,666.666… m2 ✔
Why Other Options Are Wrong:66.66 m is the breadth, not the length; 33 m and 100/√3 m are distractors; 80 m does not satisfy the area.
Common Pitfalls:Misinterpreting the phrase “half as long again” or forgetting hectare-to-m2 conversion.
Final Answer:100 meters