exam Maths Puzzle Numerical Ability

please help me with these problems

2n+5*n=77

5+1/3n=-2

9-1/4n=6

1/8n+20=32

25-1/5n=18

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exam Other Question

1.Find two consective odd integers whose sum is 116?
2.Find two consective even integers whose sum is 126?
3.Find four consective odd integers whose sum is 8?
4.Find three consective even integers whose sum is 396?
how do you write 8.0023 x 10^-3 in standard notation?