Subject: General Aptitude · Chapter: Volume and Surface Area · Exam: · Marks: · Difficulty:
What is the weight of the iron beam? I. The beam is 9 m long, 40 cm wide and 20 cm high. II. Iron weighs 50 kg per cubic metre.
Answer
SELF-PRACTICE — the source book printed no answer.
Nothing is invented here, so this question has no answer on record.
Explanation
I. gives, $l=9 \mathrm{m}, b=\frac{40}{100} \mathrm{m}=\frac{2}{5} \mathrm{m}$ and $h=\frac{20}{100} \mathrm{m}=\frac{1}{5} \mathrm{m}$. This gives, volume $=(l \times b \times h)=\left(9 \times \frac{2}{5} \times \frac{1}{5}\right) \mathrm{m}^{3}=\frac{18}{25} \mathrm{m}^{3}$. Thus, both I and II are needed to get the answer.