exam Maths Puzzle Numerical Ability

A certain kind of wood weighs 0.85 g per cubic cm. An 18cm by 12cm by 10cm block of that wood is floating in water. Approximately what weight of water does the block displace?

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exam Other Question
Solve the system by the elimination method
5x+3y=-7
7x-2y=19 simplify/factor

1/2(2x^2-x+1)^(1/2) (4x-1)(x^3+1)^1/3 + (2x^2-x+1)^1/2 1/3(x^3+1)^-2/3 (3x^2)

i think: let u = (2x^2-x+1) and w= (x^3+1)