A number is doubled and 9 is added.

A number is doubled and 9 is added. If the resultant is trebled, it becomes 57. What is that number?

Answer/Solution

5

Steps/Work

Let the number be x. Then,
3(2x + 9) = 57
2x = 10 => x = 5
ANSWER:A

General Calculator / Auto Solver

A number is doubled and is added. If the resultant is trebled, it becomes . What is that number?

Calculated Answer

5

Step by Step Solution

In order to solve problem, you must evaluate (n₁ - n₀ * 3) / (2 * 3).

n₀ =	9
n₁ =	57

(n₁ - n₀ * 3) / (2 * 3)
Evaluate n₀ * 3 = 27
(n₁ - 27) / (2 * 3)
Evaluate n₁ - 27 = 30
30 / (2 * 3)
Evaluate 2 * 3 = 6
30 / 6
Evaluate 30 / 6 = 5
5
The answer to the problem and the result of (n₁ - n₀ * 3) / (2 * 3) is 5