Question
Packet E and Packet F contained a total of 60 buttons. After 20 buttons were transferred from Packet E to B, Packet F contained thrice as many buttons as Packet E. How many buttons were there in Packet E at first?
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Packet E and Packet F contained a total of 60 buttons. After 20 buttons were transferred from Packet E to B, Packet F contained thrice as many buttons as Packet E. How many buttons were there in Packet E at first?