Mary has 100 apples which are divided into 5-apples and 10-apple packages. If the difference between the number of 5-apple packages and number of 10-apple packages is less than 10, number of 5-apple packages is x and number of 10-apple packages is y, then which of the following is true?
a) 5x + 10y = 100 x + y < 10
b) 5x + 10y = 100 ly - xl < 10
c) 5x + 10y = 100 x - y < 10
d) 5x + 10y = 100 y + x < 90
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