Question

question 22
4 pts
given y = 50, which is not a possible final value of y?
if x < 50:
y = y / 2
else:
y = y * 2
y = y + 5
55
105
30

Explanation:

Step1: Evaluate if - condition

Since we are not given a value for \(x\), but we know \(y = 50\) initially. As \(y=50\) and the condition is \(x < 50\), if \(x\geq50\) (the else - case), \(y=y*2\). Substituting \(y = 50\), we get \(y=50\times2=100\). Then \(y=y + 5\), so \(y=100 + 5=105\).

Step2: Consider other scenarios

If \(x<50\), \(y=y/2\), so \(y = 50/2=25\), then \(y=y + 5\), so \(y=25+5 = 30\) is only possible if we first divide \(y\) by 2, but the else - condition (\(x\geq50\)) will be executed as \(y = 50\) initially and we don't know \(x\) to be less than 50. When we start with \(y = 50\) and follow the else - condition first (since \(y = 50\) doesn't satisfy \(x<50\) without knowing \(x\) otherwise), we get \(y = 105\). Also, if we just consider the last operation \(y=y + 5\) after some other operation, if we assume the previous value was \(y = 50\) and we just do \(y=y + 5\) directly, \(y=55\). So 30 is not a possible final value considering the order of operations and the given if - else condition.

Answer:

C. 30