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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.
An infinite number of even numbers are less than 10.
To find a number that is 10 less than 305, you would subtract 10 from 305. So, 305 - 10 = 295. Therefore, the number that is 10 less than 305 is 295.
It is: 420-10 = 410
x - 10 is the equation you would use to find the answer. Since you don't have a specific number to subtract from, you have to use x, and "ten less than" means that you have to subtract from your first number.