Answer:
192 used stamps.
Explanation:
Since the ratio is 4 used stamps for every new stamp, you can count that as 5 stamps total. Then divide 240 by 5 to get 48. Then multiply that by 4 to get 192.
D 192
used: new: total
4: 1 : 5
We have 240 stamps
240/5 = 48
Multiply each number by 48
4*48: 1*48 : 5*48
192 : 48 : 240
There are 192 used stamps and 48 new stamps in his collections
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