book Maths Puzzle Numerical Ability

If 300 jellybeans cost you x dollars. How many jellybeans can you purchase for 50 cents at the same rate?

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book Other Question

What is the slope of the line that has the equation 4x+2y=12?
This is a multiple choice A. 6 B. 3 C. 2 D. -2
can someone solve for T please
T=6.23*10^8/yz if y=3.8*10^4 and z=2.57*10^3
MY ANSWER but i dont think its right T=6.37927503583862