twice a certain number is subtracted from 9 times the number. the results is 21. find the number
twice a certain number ... 2x
9 times the number ... 9x
is subtracted ... 9x-2x = 7x
now finish it off
Let's call the number "x".
According to the given information, twice the number is subtracted from 9 times the number:
9x - 2x = 21
Simplifying the equation:
7x = 21
To solve for x, divide both sides of the equation by 7:
x = 21/7
Simplifying,
x = 3
Therefore, the number is 3.
To find the number, let's first represent it as a variable. Let's call the number "x".
According to the given information, twice this certain number (2x) is subtracted from 9 times the number (9x). The result is 21.
To form an equation based on this information, we can write:
9x - 2x = 21
Now we can solve the equation to find the value of x:
9x - 2x = 21
7x = 21
Divide both sides by 7:
x = 3
Therefore, the number we are looking for is 3.