book Maths Puzzle Numerical Ability

23 - 5(3 - n) = -4(n - 2) + 9n

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book Other Question

the length of a rectangle is 2 meters more than its width. The area of the rectangle is 80 square meters. What is the length and width of the rectangle? An apple weighs 160grams. 85% of the apple is water. How many grams of water are there in the apple?