book Maths Puzzle Numerical Ability

how do you write x+2=1/5y in standard form

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book Other Question

Whats the fraction of 500 and 2400 what will that answer equual to
Foe e.g i think it is 500/2400 but is that right? The letters a, b, c, and d will be used to form passwords for the schools computer system. How many 4 letter passwords maybe formed if the letters can be used more than once in any passwrd?