Question

3. 60% of a number is added to 120, the
result is the same number. Find the
number?
(a) 300
(b) 200​

Answer 1

Answer:

a) 300

Step-by-step explanation:

Let the unknown number be x.

∴ 60% of x + 120 = x

⇒ (3x/5) + 120 = x

⇒ (3x + 600)/5 = x

⇒ 3x + 600 = 5x

⇒ 3x - 5x = (-600)

⇒ 2x = 600

⇒ x = 600/2 = 300