book Maths Puzzle Numerical Ability

Calculate the sum of all even positive integers from 2 to 4000.

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book Other Question

Question - How do I go about solving this problem??

The numerical value of eight more than the difference of 12 and 9 is 3.

True or false Can you answer the following and show the working out?

6/ (c - 3) - 2 (c - 4)^-1 = 0

Thanks