Question

if you add 21 to my number, multiply the result by 3, you will get 84 more than two thirds of my number. what is my number?

Answer 1

9

Explanation:

Let's suppose "my number" is x

If you add 21 to my number: 21 + x

Multiply the result by 3: 3(21+x)

You will get 84 more than two thirds of my number

`3(21 + x) = 84 + (2)/(3) x \\ 63 + 3x = 84 + (2)/(3) x \\ (7)/(3) x = 21 \\ 7x = 63 \\ x = 9`

Therefore my number is 9

If you need any help with the algebra part feel free to let me know!