exam Maths Puzzle Numerical Ability

Find all solutions algebraically for the equation:
(square root of x-10)-4=0

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exam Other Question

x-5-1/6x=25 Lawanda and Betty both drive the same distance to the shore. By driving 15 miles per hour faster than Betty, Lawanda can get there in 3 hours while Betty takes 4 hours. How fast does each drive?
How do I solve this?