exam Maths Puzzle Numerical Ability

Let function f be defined by f(x)=x+1. If 2f(p)=20, what is the value of f(3p)?

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What is 160% of $47.99 ? A 2000L tank containing 550L of water is being filled with water at the rate of 75L per minute from a full 1600L tank. How long will it be before the two tanks have the same amount of water?