Oh, dude, 15 less than 20 is 5. Like, you just take 20 and subtract 15 from it, and boom, you've got your answer. It's not rocket science, just basic math, my friend.
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Five
Let's represent the unknown number as "x." The equation for "five less than a number is 15" can be written as x - 5 = 15. To solve for x, we add 5 to both sides of the equation, resulting in x = 20. Therefore, the number in question is 20.
would it will be 15
15 and 9 are both odd, composite numbers less than 20.
The number that 30 is ten less than is 40. Half that is 20. So the question becomes "what number is as much more than 10 is less than 20". This is gobbledygook, but if I rephrase to say "what number is as much more than 10 than 10 is less than 20", then since10 is less than 20 by 10, I guess 20.