Understaing the significance test

@neha30 wrote:

I saw one question regarding Z test (Que.3) in here:

A test is administered annually. The test has a mean score of 150 and a standard deviation of 20. If Ravi’s z-score is 1.50, what was his score on the test?
A) 180
B) 130
C) 30
D) 150
E) None of the above

I am not able to understand the explanation for the answer. Can someone please explain how the answer is A. I have the idea about the z test and its formulation.

Thanks

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