book Maths Puzzle Numerical Ability

What is the answer to th following question: Solution A is 30% acid and solution B is 70% acid. How much of each should be used to make 100 mL of a solution that is 58% acid?

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Find the average speed for the given distance and time. A train travels 75 miles in 55 minutes. Please please please I need help for the following question asap :-(.

Show that if x2 > x1 then x2^3 + 2x2 + 7 > x1^3 + 2x1 + 7 for all x1, x2 which belong to R. Without using c