Loading [MathJax]/extensions/tex2jax.js
 
    কোন সংখ্যার 40% এর সাথে 42 যোগ করলে ফলাফল হবে ঐ সংখ্যাটি । উহা কত?

A    70

B    80

C    90

D    75

Solution

Correct Answer: Option A

 

(x×40%)+42=x

or, 40x/100-x=-42

or, 2x/5-x=-42

or, 2x-5x/5=-42

or, -3x=-210

or, x=70

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