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--> 5p=20
--> p=20/5 = 4
2. t/2+t/4=6
-->2t/4+t/4=6
-->3t/4=6
-->3t=6.4
-->3t=24
-->t=24/3 = 8
5p = 21-1
5p = 20
p = 4
t t
-- + -- = 6
2 4
--------------------------------------------------- x 4
2t+t = 24
3t = 24
t = 8