exam Maths Puzzle Numerical Ability

please show me how to work these problems using the substitution method:

1/2x+1/3y=3
y=3x

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exam Other Question

how many grams of sugar must be added to 60 grams of a solution that is 32% sugar to obtain a solution that is 50% sugar If log3(x+1)-log3(x-1)=2, then x=A/8 where A=