book Maths Puzzle Numerical Ability

I need lots of help in math, my teacher said im doing alegbra 1 but it is also alegbre 2. I dont understand any of it. Not the equation part nor the inequalities. Could you pleas elp me out

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A chef needs to mix a 45% fat content cheese with a 20% fat content cheese to obtain 30 grams of a cheese mixture that is 30% fat. How many grams of each kind of cheese must be used? graph y=3sinx and y=sin 3x on the same axes. label the graph of each function.

I know the amp. of first function is 3 and period is 2pi and for second function amp. is 1 and period is 2pi/3 i just dont know how to graph