1 + 6 = 7
42/7·1 = 6 cm
42/7·6 = 36 cm
@lucianop
120 = a+8a/7 = 15a/7
a = 120*15*7= 56 cm
b = 8a/7 = 56/7*8 = 64 cm
a+a/6 = 7a/6 = 42
a = 42/7*6 = 36 cm
b = 36/6 = 6 cm
7b/2-b = 5b/2 = 90
b = 90/5*2 = 18*2 = 36 cm
a = 7b/2 = 36/2*7 = 126 cm
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