15 less than 7 times a number is:15-7n
Less. Although "15" may be more than 5, the negative sign means that the "15" is actually less than 0. Since 5 is greater than 0 and -15 is less, -15 is less than 5.
That means that the sum of the number's factors, less than the number itself, is less than the number in question - in this case, if you add the factors of 15 (except 15 itself, which is also a factor of 15), you get a total that is less than 15.
15 is more than 2.
X = number. 4X + 9 = 2X - 15 ===========
15/17 is less than 1. 17/15 is more than 1.
x² - 15
The mystery number is less than one (a fractional number).
No, however there are even numbers less than 15. An even number is any number that can be divided by two evenly, so it can be greater than 15 too.