Question 1006875
let x = the amount he earns in all months except july and august.
in july he earns 5x.
in august he earns 3x.


the total he earns all year is 10x + 3x + 5x = 18x


in july and august he earns 3x + 5x = 8x.


the fraction of his entire years earning that he earns in july and august is 8x/18x = 4/9.


4/9 * 18 = 8
5/9 * 18 = 10


add them up and you get a total of 18.


the fraction you are looking for is 4/9.


that's the fraction of his total earnings that he earns in july and august.