Mrs. Diaz must save $150 on average each month.
Step-by-step explanation:
Total amount to be saved = $1500
Amount saved in 4 months = $300
Amount left to be saved = Total amount - saved amount
Amount left to be saved = 
Remaining time = 8 months

Mrs. Diaz must save $150 on average each month.
Keywords: Subtraction, Division.
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