book Maths Puzzle Numerical Ability

How many games have to be played to determine a champion from 64 teams in a tripple elimination tournament?

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book Other Question

I need help please with the following equations:

-8 is less than/equal to 4d - 26

15 + 2(5z - 50) <68

5 - 40X <125

9n - 54 > -36

Thank you so much!!
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2x+y=-3 3x+y=8?

How do you write an equation of the li