Subject
Quantitative Aptitude
Topic
Areas & Volumes
A water tank is 30 m long, 20 m wide and 12 m deep. It is made of iron sheet which is 3 m wide. The tank is open at the top. If the cost of the iron sheet is 10 Tk. per metre, then the total cost of the iron sheet required to build the tank is-
A water tank is 30 m long, 20 m wide and 12 m deep. It is made of iron sheet which is 3 m wide. The tank is open at the top. If the cost of the iron sheet is 10 Tk. per metre, then the total cost of the iron sheet required to build the tank is-
ক)
6000 tkখ)
8000 tkগ)
9000 tkঘ)
10000 tkExplanation
(প্রশ্ন- ৩০মিটার দীর্ঘ,২০ মিটার চওড়া ও ১২ মিটার গভীর একটি পানির ট্যাংক ৩ মিটার চওড়া লোহার পাত দ্বারা তৈরি। ট্যাংকের উপরিভাগ উন্মুক্ত।প্রতি মিটারে লোহার খরচ ১০ টাকা হলে ট্যাংকটি নির্মাণে লোহার পাতের উপর মোট খরচ কত?) উপরের অংশ (lb) উন্মুক্ত,তাই ট্যাংকের ক্ষেত্রফল = lb + 2h (l + b) = [30 × 20 + 2 × 12 × (30 + 20)]m 2 = 1800 m 2 অতএব ব্যবহ্নত পাতের ক্ষেত্রফল == 1800 m 2 ব্যবহ্নত পাতের দৈর্ঘ্য =1800/3 m =600 m মোট খরচ =দৈর্ঘ্য× একক দৈর্ঘ্যে খরচ =600×10 =6000 টাকাRelated questions
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