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Question
Reza's average in four tests is 80% . what marks does he need in his fifth test to raise his average to 84% .
96%
94%
84%
100%
None of them
ANSWER : 4
Descrption
<pre>ধরি, প্রথম 4টি exam এর যোগফল x এবং 5th exam এ পাওয়া marks y <math xmlns = "http://www.w3.org/1998/Math/MathML"><mfrac><mi>x</mi><mi>y</mi></mfrac><mo> = </mo><mn>80</mn><mspace linebreak = "newline"/><mi>x</mi><mo> = </mo><mn>4</mn><mi>x</mi><mn>80</mn><mspace linebreak = "newline"/><mi>a</mi><mi>n</mi><mi>d</mi><mo>,</mo><mfrac><mrow><mi>x</mi><mo> + </mo><mi>y</mi></mrow><mn>5</mn></mfrac><mo> = </mo><mn>84</mn><mspace linebreak = "newline"/><mi>S</mi><mi>o</mi><mo>,</mo><mi>Y</mi><mo> = </mo><mn>5</mn><mi>x</mi><mn>84</mn><mo> - </mo><mi>x</mi></math> অথাৎ 100% </pre>
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