The bar graph shows the number of hi-fi systems sold by Mr. Chong in 4 months. The bar that shows the number of hi-fi systems sold in April has not been drawn. The number of hi-fi systems sold in March was 25% of the total number of hi-fi systems sold in the 4 months.
- What was the total number of hi-fi systems sold in the 4 months?
- What was the number of hi-fi systems sold in April?