The total number of cameras and printers sold by shop A is how many more than…

Concept: When a table gives a fraction or percentage of a quantity, divide the given value by that fraction to recover the whole quantity.

For a part-to-part ratio, write both quantities as common multiples; when their total is known, subtract the known parts to obtain the missing part.

Application

1. Shop A cameras: 40% of the number of cameras is 200, so the full number is 200 ÷ 0.40 = 500.

2. Shop A speakers: cameras to speakers is 5:3. Thus speakers = 500 × 3/5 = 300.

3. Shop A printers: cameras + printers + speakers = 1160, so printers = 1160 − 500 − 300 = 360.

4. Shop D printers: half of the number of printers is 190, so the full number is 190 × 2 = 380.

5. Required excess = (shop A cameras + shop A printers) − shop D printers = (500 + 360) − 380 = 480.

Cross-check: Shop A has 500 + 360 = 860 cameras and printers together, and 860 − 480 = 380, which equals the independently recovered number of printers for shop D.

Therefore, the required number is 480.