exam Maths Puzzle Numerical Ability

Of all failures of a certain of computer hard drive, it is determined that 20% of them only the sector containing the file allocation table is damaged, in 70% of them only nonessen

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3. Steve traveled 600 miles at a certain speed. Had he gone 20mph faster, the trip would have taken 1 hour less. Find the speed of his vehicle. how do you solve 8y^2-12y+4=y+10