Question

a+b=10
b+c=20
c+d=30
=
a+b+c= ?​

Answer 1

Answer:

a+b=10

b+c=20

c+d=30

a+b+c= 30

explanation:

0 + 10 = 10

10 + 10 = 20

20 + 10 = 30

hope this helps!

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