exam Maths Puzzle Numerical Ability

There are 3 red and 7 black marbles in a bag. If I am blindfolded, how many times must I reach in and pull out a marble before I am sure it is a black one?

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exam Other Question
find four consecutive even intergers such that six times the sum of the first two exceeds twice the sum of the first and the forurth by 416 I typed the equation wrong!!!!!!!!!

This is what it should have been

2x -4y =8
x - 2y = 4

thanks,

dnn