A brick weighs 4 kg, plus half a brick. How much does a brick weigh?

We write down the total mass of the brick equal to x kg.

In this case, half of the brick will weigh: 1/2 * x.

We compose the following equation:

x = 4 + 1/2 * x.

We transfer equal parts to one side, while changing the sign to the opposite.

x – 1/2 * x = 4.

1/2 * x = 4.

x = 4 / 1/2 = 4 * 2/1 = 8 kg.


The brick weighs 8 kg.

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