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2 (7a + 5a)=240
2 ( 12a ) = 240
24a = 240
a = 240/24
a = 10
lebar = 5a
= 5 x 10
= 50
jawabnnya 50
p=7l/5
K=240
K=2p+2l
240=2(7l/5)+2l
240=14l/5+2l
240=24l/5
l=50cm