exam Maths Puzzle Numerical Ability

Divide. Write your answer in lowest terms.
6t/5w divided by 9tw/w

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60% of the area of Rectangle A is the same as 80% of the area of Rectangle B. Rectangle B is 25cm2 smaller than Rectangle A. Given that they both have a length of 25 cm, find the difference in their perimeter.

Rmks: Pls try not to use algebra. The function y=3^x has been transformed to y=2*3(^-1/2x-1) +8. What is the mapping rule for the image of y=3^x??? I think the answer is (x,y)--(-2x+1,1/2y-8)??????? Can someone ple