Four bricks

A trolley carrying 4 bricks weighs 16 kg. When 1 brick is taken away, it weighs 13.5 kg. How much does it weigh if 1 brick is in the trolley?

Correct answer:

x =  8.5 kg

Step-by-step explanation:

m4=16 kg m3=13.5 kg  b=m4m3=1613.5=25=2.5 kg  x=m32 b=13.52 2.5=8.5 kg

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