book Maths Puzzle Numerical Ability

the sum of two consecutive odd integers is 40 find the numbers

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book Other Question

Solve the system by graphing.

3x+y=6
3x-y=0
how can i see how many cases are in solving this rational inequality:(x+1)(x+2)/(x-1)? how will I be able to see the possible cases.What general rule should I actually follow?