Question

Three times the sum of a number and four is twenty-one. Find the number.

The number is ___

Answer 1

n = 9/3 = 3

Explanation:

Translating these words into symbolic statements:

3(n + 4) = 21.

Perform the indicated multiplication, obtaining:

3n + 12 = 21

Combine the constant terms: 3n = 9

Finally, solve this for n: n = 9/3 = 3

Answer 2

The answer to your question is: x = 3

Explanation:

3(x + 4) = 21

x + 4 = 21/3

x + 4 = 7

x = 7 - 4

x = 3