exam Maths Puzzle Numerical Ability

A solution containing 30% insecticide is to be mixed with a solution containing 50% insecticide to make 200 L of a solutions containing 42% insecticide. How much of each solution should be used?

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exam Other Question
Write the augmented matrix for each system of equations
x + 3y = 5
y - 4z = 8
-2x = 5z = 7 Can you help with find the solution of sets for

|3x+4|< 13