exam Maths Puzzle Numerical Ability

Please help me solve this equation. {How many grams of 4% salt solution must be mixed with 80 grams of 11% salt solution to make an 8% salt solution?}

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can you please help me with this problem: (((The amount of money that a salesperson makes varies directly as the total amount of sales made. If the salesperson receives $7,500 for Find the area of a rectangle if three of its corners are (-0.1,-3.4), (-7.9,-3.4), and (-0.1,6.8). Any help with this would be appreciated. Thank you in advance.