exam Maths Puzzle Numerical Ability

if y^2=9; then y=?

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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? Help.
Javier invests money in two accounts.He invests twice as much in an account paying 10% simple interest as he does in an account paying 5%. If he earns $187.50 in one year f