Answer:
Explanation:
To solve the problem, let's break it down step by step.
1. Let's assume the prime number is represented by 'x'.
2. The first operation is multiplying the prime number by 7: 7x.
3. The next operation is adding 7 to the previous result: 7x + 7.
4. The final operation is dividing the previous result by 2: (7x + 7) / 2.
According to the problem, this result should equal 21:
(7x + 7) / 2 = 21
To find the prime number 'x,' we can solve the equation:
7x + 7 = 21 * 2
7x + 7 = 42
Subtracting 7 from both sides:
7x = 42 - 7
7x = 35
Dividing both sides by 7:
x = 35 / 7
x = 5
Therefore, the prime number that satisfies the given conditions is 5.