exam Maths Puzzle Numerical Ability

Simplify each of the followingby combining like terms.

#36

x^2y + xy - y + 10x^2y - 2y + xy

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exam Other Question

How many liters of a 60% salt solution must be added to 20 liters of a 12% salt solution to produce a 40% salt solution? Given:
(l ^ ~m)->p
q-> ~p
l
q
prove: m