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প্রশ্নে বলা হচ্ছে যে, 12 জন বালকের গড় বয়স 15 বছর। নতুন একজন বালক আসলে তাদের গড় বয়স হয় 14 বছর। নতুন বালকের বয়স কত ?

12 জন বালকের বয়সের সমষ্টি = 12 × 15 = 180 বছর

আবার, নতুন একজন বালক আসায় 13 জন বালক হবে ঐ দলে ।

∴ ঐ 13 জনের বয়সের সমষ্টি = 13 × 14 = 182

∴  নতুন বালকের বয়স = 182 – 180 = 2 বছর।

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Write a precis of the following passage with a suitable title:Most men long for wealth, Wealth, they think, brings happiness. But often, wealth brings a deal of worry without much happiness. A millionaire is a very wealthy man, of course, but his great wealth is also a great responsibility. He may have many large estates and factories. Estates and factories usually need a lot of attention. There may be disputes between the millionaire and his workers over one trouble or another. These disputes may lead to strikes and conflicts, for which the millionaire may lose a lot of money. Or some gangster may kidnap the millionaire's child and demand a huge ransom for the safe return of the child. A very rich man, therefore, in spite of his great wealth, may not have an easy life. He has many worries. These worries may be greater than the worries of a poor man.
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