Your change from R50,if you spend y rand

50-y

You can easily do stuff like this if you use an actual number, and then study how you solved it.

Suppose you had R50 and spent R10.
What is the change?

To determine the change from R50 if you spend y rand, you would subtract the amount you spent from the initial amount of R50. The formula to calculate the change would be:

Change = R50 - y

For example, if you spend R20, the change would be:

Change = R50 - R20
Change = R30

Therefore, the change from R50 if you spend y rand, where y represents the amount spent, would be R50 - y.