Fifteen less than twice a number is 21.
What is the missing number? |

2y - 15

Step-by-step explanation:

well 15 LESS than TWICE a number. okay so let’s start off by making a variable for the unknown number y. the variable is y. so now we have to think, TWICE that number, but we don’t know the number.

Now that we have the variable and we know it has to be doubled, let’s start off making the first half... we can out that into 2y. which is 2 multiplied by the unknown number.

now that we have the first half done, we have to take the 15 less. Less can mean  or subtract in this kind of situation. but for this certain scenario, it will be subtraction. so the equation would be 2y - 15.

One yard is 3 feet. 1 foot is 12 inches. so there's 36 inches in one yard. now, with that, 36 divided by 3 is 12. twelve 3 inch segments in one yard. using this logic, two yards has 24, three yards has 36, four yards have 46. and, four and a half yards has 52 three inch segments