exam Maths Puzzle Numerical Ability

Hello I am struggling with this question in my college course work any help would be appreciated...

(e^x)^4 e^5
____________= 3

e^2x

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exam Other Question

Can someone help me show the number is rational by writing it as a quotient of two integers:

22
Mrs Tan bought a DVD player and a HI-FI set at a discount of 20%. She paid a total of $2800. If the price of the DVD player is 40% that of the HI-FI set, what was the price of the DVD player before the discount?