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$40$ এর $15\%$, একটি সংখ্যার $25\%$ এর চেয়ে $2$ বেশি। সংখ্যাটি কত?

Options :

  • (A) $12$
  • (B) $16$
  • (C) $24$
  • (D) $32$

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মনে করি, সংখ্যাটি $x$

তাহলে, প্রশ্নানুসারে,

$40$ এর $15\% - x$ এর $25\%=2$

বা, $40$ এর $\frac{15}{100} - x$ এর $\frac{25}{100}=2$

বা, $40$ এর $\frac{15}{100} - x$ এর $\frac{25}{100}=2$

বা, $\frac{40 \times 15}{100} - \frac{x \times 25}{100}=2$

বা, $\frac{{\displaystyle\overset{\overset2{\bcancel4}}{\bcancel{40}}}\times{\displaystyle\overset3{\cancel{15}}}}{\displaystyle\underset{\underset{\cancel5}{\bcancel{10}}}{\bcancel{100}}}-\frac{x\times\cancel{25}}{\displaystyle\underset4{\cancel{100}}}=2$

বা, $6-\frac x4=2$

বা, $\frac{24-x}4=2$

বা, $24-x=2\times4$

বা, $24-x=8$

বা, $24-8=x$

বা, $16=x$

$\therefore x=16$

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