book Maths Puzzle Numerical Ability

Evaluate this problem and answer in the lowest terms:

9/11 - 3/11 + 7/11

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book Other Question

simplify
2(3x+y)+5(x+2y)
If the average person drinks 8, (8oz) glasses of water per day, a person who drinks 12.8 oz of water after a morning exercise session has consumed what fraction of the daily average?