book Maths Puzzle Numerical Ability

can someone solve for T please
T=6.2310^8/yz if y=3.810^4 and z=2.57*10^3
MY ANSWER but i dont think its right T=6.37927503583862

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book Other Question

If 300 jellybeans cost you x dollars. How many jellybeans can you purchase for 50 cents at the same rate? Solve the logarithmic equation. Round the result to the three decimal places if necessary.

-5 + 2 ln x = 5