I'm assuming you are talking about War Ration Book One since the same coupons are still intact in my book. My research has shown that they were each for 1 pound of coffee and were valid for 5 weeks.
US ration coupons numbered 19, 20, and 22 were used to purchase sugar during World War II when sugar was rationed due to shortages. Each coupon had a specific value and could be exchanged for a designated amount of sugar to help conserve supplies for the war effort.
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60
5
"http://wiki.answers.com/Q/What%20is%20e-retail%20model%20and%20compare%20its%20strength%20and%20weakness%20with%20traditional%20retail" "http://wiki.answers.com/Q/What%20is%20e-retail%20model%20and%20compare%20its%20strength%20and%20weakness%20with%20traditional%20retail"
"http://wiki.answers.com/Q/What%20is%20e-retail%20model%20and%20compare%20its%20strength%20and%20weakness%20with%20traditional%20retail" "http://wiki.answers.com/Q/What%20is%20e-retail%20model%20and%20compare%20its%20strength%20and%20weakness%20with%20traditional%20retail"
The GCF is 5.
420
The LCM is: 40
The GCF is 4.
10
20
The GCF is 4.