exam Maths Puzzle Numerical Ability

19+(x/2)=4

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-1/5d-1=12

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Given that a set of data has a constant ratio of 8 and an initial value of 6, what is the rate of increase k? A covered urn contains red, white, black, and green marbles. A player received $2.00 if he draws a red marble, $1.50 if he draws a white marble, $3.00 if he draws a black marble. T