Exam Maths Puzzle Percentage

7 2/5% of x is equal to 74. Solve for x.

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Exam Other Question

If 3 times Jane's age, in years, is equal to 8 times Beth's age, in years, and the difference between their ages is 15 years. How old are Jane and Beth? Graph
y=x^5/3 - 5x^2/3

Find the area between the curves
a)x=y^3 and y=x^1/2
b)y=-x^2 + 4 and y-x=-8