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কোনো সংখ্যার 40% এর সাথে 42 যোগ করলে ফলাফল হবে ঐ সংখ্যাটি। উহা কত?
70
80
90
75
ANSWER : 1
Descrption
ধরি, সংখ্যাটি = x ∴ x<math xmlns = "http://www.w3.org/1998/Math/MathML"><mo>×</mo></math>40% + 42 = x <math xmlns = "http://www.w3.org/1998/Math/MathML"><mo>⇒</mo><mfrac><mrow><mi>x</mi><mo>×</mo><mn>40</mn></mrow><mn>100</mn></mfrac><mo> + </mo><mn>42</mn><mo> = </mo><mi>x</mi><mspace linebreak = "newline"/><mo>⇒</mo><mfrac><mrow><mn>2</mn><mi>x</mi></mrow><mn>5</mn></mfrac><mo> + </mo><mn>42</mn><mo> = </mo><mi>x</mi><mspace linebreak = "newline"/><mo>⇒</mo><mn>2</mn><mi>x</mi><mo> </mo><mo> + </mo><mn>210</mn><mo> = </mo><mn>5</mn><mi>x</mi><mspace linebreak = "newline"/><mo>⇒</mo><mn>3</mn><mi>x</mi><mo> = </mo><mn>210</mn><mspace linebreak = "newline"/><mo>.</mo><mo>'</mo><mo>.</mo><mo> </mo><mi>x</mi><mo> = </mo><mfrac><mn>210</mn><mn>3</mn></mfrac><mo> = </mo><mn>70</mn></math>
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