Four times a number is 21 more than the number. What is the number?
I think the answer is 7!
Four times a number is 21 more than the number ----> 4x = 21 + x
3x = 21
x = 7
Anna "thought" the answer is 7
Now you can be 100% sure that the answer is 7
Very funny.....
Princess Anna -- at least Prof Reiny showed the student how he got the right answer.
Yeah, guess your right. I wasn't really sure about this one.....
but, yeah the answer is
7 as Reiny has just explained.
To find the number, let's define a variable and set up an equation based on the given information. Let's call the number "x".
According to the question, four times a number is 21 more than the number. Mathematically, we can write this as:
4x = x + 21
Now, we can solve this equation to find the value of x.
To do that, we'll first simplify the equation by combining like terms:
4x - x = 21
This becomes:
3x = 21
Next, we isolate x by dividing both sides of the equation by 3:
3x/3 = 21/3
Simplifying further:
x = 7
Therefore, the number is 7.