25
It is: 15-5 = 10
Yes 15 is a deficient number because its factors add upp to less than the number itself,which is 15.
15
7 or 13
150
Five
The only two integer numbers greater than 12 and less than 15 are 13 and 14. Of these, only 14 is even. Therefore, the answer is 14.
would it will be 15
15 less than 7 times a number is:15-7n
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.
989. If there is a remainder of 2 when divided by 3, the number is one less than a multiple of 3. If there is a remainder of 4 when divided by 5, the number is one less than a multiple of 5. Thus the number required is one less than a multiple of the lowest common multiple of 3 and 5 (that is 15). So what is needed is an even multiple of 15 less than or equal to 1000: 1000 ÷ 15 = 662/3 Thus the highest even multiple of 15 not greater than 1000 is 66 x 15 = 990, and the required number is 989.
15
x² - 15
25
'5' & '15' are odd numbers less than 20 , and are also multiples of '5'.
The answer is 2. 2 goes into 30 15 times, so it is a factor of 30.