exam Maths Puzzle Numerical Ability

What is Youngs rule and what is the equation?

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exam Other Question

three numbers are such that the second is two less than three times the first and the third is four times the first. the sum of the three numbers is 38. find the largest and smallest numbers? x=2y-7
y-3x=-9

2x+5y=12
x-6y=-11

x+y=6
3x-3y=13