book Maths Puzzle Numerical Ability

the sum of two consecutive numbers is 15

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I didnt know which topic to put this under but i need it simplified please.
The numbers on the left and right of the multiplication sign are ment to be fractions where the / sign
What is the distributive for mulitiplication over (+) and (-) , additive inverseadditive property,additon property of equality,multiplicative inverse,multiplictaive identity,multip