\(x=y-(50/y)\), where x and y are both positive numbers. If the value of y is doubled, the value of x will.
A. Decrease
B. stay the same
C. double
D. increase to more than double
Explanation: y কে double করা হলে x এর নতুন value হয় \(2y - (50/2y) = 2y - 25/y\). যেহেতু এই expression টির positive part টি doubled হয় (\(y\) becomes \(2y\)) এবং negative part টি halved হয় (\(50/y\) becomes \(25/y\)) x এর value will increase to more than double. For example, যদি \(y=25\) হয়, \(x=25-(50/25)=23\). Y কে double করা হলে \(y=50\), \(x\) এর নতুন value হয় \(=50-(50/50)=49\) which is more than double of 23, the previous value of x.
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