book Maths Puzzle Numerical Ability

2/3x=24,...

3(x-5)+7=16,...

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OOOKAY! First time here hope you can help. I've been learning to solve systems of linear equations but when it comes to word problems I have no idea.
The hands of a clock are to How many different 6-digit numbers can be written using all of the following digits: 2,5,5,6,6,6 ?