The sum of two different numbers multiplied by 3

Answer 1

is equal to 30

Let x and y be the two different numbers

x + y = 30/3

x + y = 10

x = 10 - y

3(x) = 3(10 - y)

30 = 30 - 3y

3y = 0

y = 0

Answer 2

3(a+b)

Answer 3

incomplete question,
how can the robot just assume it is 30 ?