exam Maths Puzzle Numerical Ability

please help me solve.

x^2=11x=24=0

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exam Other Question

there were 3/4 as many women as there men in a train yesterday. at the next station, 12 women and 6 men got in. as a result, there were 6/7 as many women as men on the train. how many men and women were in the train at first? (4|5-3|2)(2|5+4|2) im stuck on this problem and need some help thanks