exam Maths Puzzle Numerical Ability

I am the worst at story problems can someone help? I have to write a system of 2 equations in 2 unkown and solve each system by substitution.

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exam Other Question

The sum of three numbers is 8. Twice the smallest is 2 less than the largest, and the sum of the largest and smalles is 5. Use linear system in three variables to find the three numbers. Solve each of the equations for the missing variable using whichever properties and method seems appropriate. I hope someone can show me how these are done:)
a) 125^x=sqrt5
b)log