exam Maths Puzzle Numerical Ability

the sum of two numbers is 12. three times the larger minus 4 is equal to 5 times the smaller. what are the numbers?

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exam Other Question

Solve for x: 64(^x-2)=16(^1/3) I think the answer is x=20/9 ??? Simplify:
a) (-2x(^-1)+x(^2))^-2
b)(3x(^-1)+2y(^-1))^-2
c) (5(^x-4))^2(3(^-2x)^5(3^2)(^3x)/5^3(3)(5(^x+1)
I hope someone can figure out what I have typed here because I am in