exam Maths Puzzle Numerical Ability

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?

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exam Other Question

Find a polynomial with leading coefficient 1 and degree 3 that has -1, 1, and 3 as roots. tickets for homecoming dance cost $20 for a single ticket or $35 for a couple. ticket sales totaled $2280, and 128 people attende. how many tickets of each type were sold?