Two bricks

One brick weighs 1kg and half a brick, how many weigh two bricks?

Correct result:

m =  4 kg

Solution:

 x=1+x/2  x=2  x=2  m=2 x=2 2=4 kg \ \\ x=1 + x/2 \ \\ \ \\ x=2 \ \\ \ \\ x=2 \ \\ \ \\ m=2 \cdot \ x=2 \cdot \ 2=4 \ \text{kg}



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