Results for: 15-number

Why isn't 15 a prime number?

A number is prime if it has only 1 and itself as factors. For example, 7 is a prime number because it has only 1 and 7 as factors. 15 isn't a prime number because it has 1, 3, (MORE)
In Numbers

Is 15 an irrational number?

No. Irrational numbers are numbers which cannot be expressed as a fraction p/q where p and q are integers. Because 15 can be expressed as 15/1, it is not irrational. It is act (MORE)

Is the number 15 a lucky number?

yes it is the luckiest number in the world and nobody can deny it Well, I shall try to, where does this idea come from. Thinking a certain number is lucky is the short road t (MORE)

120 is 15 percent of what number?

To solve this you need to work out how big a number 1 percent of the number would be. So if 120 is 15 % then 1% = 120/15 = 8 Thus if 1 % of the number = 8, you need to mak (MORE)
In Numbers

If the average of 15 consecutive numbers is 15 what are the numbers?

The numbers are 8 to 22 (inclusive). It immediately springs to mind that if 15 is the average then the numbers will start at 15 - 7 (8) and finish at 15 + 7 (22), but let's pr (MORE)
In Science

Is -15 a natural number?

No. Natural numbers include the set of *non-negative* integers. (An integer being the set of all numbers which have no decimal point. e.g. -1, 0, 1, 2, 3)
Thanks for the feedback!

What is the answer to 20c plus 5 equals 5c plus 65?

20c + 5 = 5c + 65 Divide through by 5: 4c + 1 = c + 13 Subtract c from both sides: 3c + 1 = 13 Subtract 1 from both sides: 3c = 12 Divide both sides by 3: c = 4
Thanks for the feedback!
In Numbers

Is 15 an even number or an odd number?

Odd. All numbers ending in five are odd. In general, if a number isnot divisible by two, it is odd.
Thanks for the feedback!