book Maths Puzzle Numerical Ability

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?

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can you please help me to understand how to solve problems such as this one below:
-18=m/6
A rectangular field is three times as long as it is wide. if the perimeter of the field is 400 yards, what are the field`s dimentions?