exam Maths Puzzle Numerical Ability

If "a" is a negative number find
(a)+a+(-2a)+(-a)

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exam Other Question

Can you please help me solve using the substitution method?

x + 7y = 16
-3x + 6y = 33 How many liters of an 11% alcohol solution should be mixed with 60 liters of a 5% alcohol solution to obtain a mixture that is 7% alcohol?