book Maths Puzzle Numerical Ability

please help me with this.

p + 1/3p = 2/3

will you show me how you did it?

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book Other Question

What three consecutive numbers have a sum which is 1/5 of their product A quantity, its 2/3, its 1/2 ,and its 1/7 , added together, become 9. What is the quantity?

A) 42/97 B)197/42 C) 873/42 D)378/55

If possible please show me how to do a problem like this.