book Maths Puzzle Numerical Ability

Speed limit 35 mph. ticket for going 44 mph and one for going 51 mph. Second ticket cost 21 dollars more than the first one. What is the cost of going over the speed limit.

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book Other Question

4x(x-2)less than 2(2x-1)(x-3)
solve,graph and write your answer in interval notation Tim has completed 2/3 of his math homework. If Tim has completed 12 problems, how many problems were on his homework?

i need an accurate equation so I can study for a test. thanks for your help