book Maths Puzzle Numerical Ability

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.

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book Other Question

Solve the system by the addition method

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

x/5-y/3=-3/5
There were 5 times as many boys as girls at the party. Also, the number of boys was 100 less than 15 times the number of girls. How many boys and girls came to the party?