book Maths Puzzle Numerical Ability

An apple weighs 160grams. 85% of the apple is water. How many grams of water are there in the apple?

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book Other Question

23 - 5(3 - n) = -4(n - 2) + 9n I have two questions I am stuck on these problems and how to graph them.
y>3 and the other problem is 4x+y is greater than or equal to 4.
I appreciate the help
thank you very m