Question

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Answer 1

A) 3c.2+4c.2+5c.2= x
B)12c.2=120
12c= 120/2
12c = 60
C= 60/12
C= 5


Prova Real:
3.5.2+4.5.2+5.5.2
15.2+20.2+25.2
30+40+50
70+50
120

Answer 2

5c + 3c + 4c + 3c + 5c + 4c = 24c
120 ÷ 24 = 5 C= 5 cm