exam Maths Puzzle Numerical Ability

Find the exact value of x if 7^x=3^5 I think the answer is 5log3/log7???

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exam Other Question

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. For a sample of size n-100, proportion p-0.6, and at a 95% confidence level, What is the upper bound of the proportion?