exam Maths Puzzle Numerical Ability

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

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exam Other Question

how do you solve and then graph the parabola: y= -x(to the second power) + 2x+3

this is not from a textbook***
please show me how to work these problems using the substitution method:

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