Riddle: I had $370.00. My Mom gave $150.00. My Dad gave $150.00. My Aunt and Uncle gave me $100.00. I had another $30.00. How much did I have?
Answer: If you read the question carefully, the question asked about your first money with “how much money Did I really have?”.
The money you had is 150 dollars. That is before your parents and relatives gave you additional money.
However, given that the logic and time of the tense is in the past, it is safe to assume that the question pertains to the money you had originally before you received external money from someone else.
Therefore, you had 370 dollars and another 30 dollars originally with you, which sums up to 400 dollars.