book Maths Puzzle Numerical Ability

Solve the system by the addition method

x/3-y/2=-5/6

x/5-y/3=-3/5

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book Other Question

75-x p
---- =---
75 100
The solution of the equation log(log x)=1 is x=10^10. Is this one true or false. I believe that it is false but want to make sure before I turn it in that it is correct.