exam Maths Puzzle Numerical Ability

Please show me step by step solutions for this problems that is in the text books that I listed for you.

Thank-you.

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exam Other Question

1. An owner of a gourmet food store has two varities of herbal tea, one that cost costs $4.00 per kilogram and another that cost $5.00 per kilogram. how many kilograms of each type are needed to make 20 kg of a blend worth $4.60 per kilogram? Can anyone help me solve this problem: determine the equation of the line that has a slope of 1/2 and passes through the point (4,2). Write the equation in standard form