exam Maths Puzzle Numerical Ability

Solve
root of 2x+8=x

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exam Other Question

Can I please have some help with this question. This is a problem given by my instructor. I have come up with a different answer every time. I am either leaving out a step or performing too many. THANKS!!!!

y/5 - 2/5 = 1/3 - y
The time t required to drive a fixed distance varies inversely as the speed r. It takes 5hr at 55mph to drive a fixed distance. How long would it take at 40mph?