exam Maths Puzzle Numerical Ability

6(x-1)not equal to 18 this has to be solved for x

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exam Other Question

how much antifreeze must be added to 12L of 40% solution of antifreeze to obtain a 60% solution? Ingrid"s age is 5 years less than 2 times Danika"s age. If Ingrid is 25 years old, which equationcan be used to determine Danika"s age?