Question

Half the difference of a number n and 20 is 30. What is the number?​

Answer 1

Number is 40

Explanation:

Let the number be n

(n - 20)/2 = 30

(n - 20) = 2 × 30

n = (2 × 30) + 20

n = 60 + 20

n = 80

Answer 2

• 80

Explanation:

• Half the difference of a number n and 20 ⇒ (n - 20)/2
• ... is 30 ⇒ = 30

Solve the equation for n:

• (n - 20)/2 = 30
• n - 20 = 30*2
• n - 20 = 60
• n = 60 + 20
• n = 80

The number is 80