book Maths Puzzle Numerical Ability

a 20% jasmine tea will be added to a 25% jasmine tea. how much of the 20% jasmine tea should be added to the 25% jasmine tea is needed to make a 15lb-mixture of 15% jasmine tea?

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book Other Question
a plane flies 465 miles with the wind and 345 miles against the wind in the same length of time. if the speed of the wind is 20 mph, find the speed of the plane in still air. Please show me how to solve: (x/y)^3 / (x/2y)^3

(x/y) is a fraction and (x/2y) is a fraction

Thank you!!!!!!!!!!!